Story highlights Britain's Prince William and Kate have released the third official portrait of Prince George 
 
 The photo shows George with his parents at their London residence, Kensington Palace 
 
 The 8-month-old is traveling with his parents to New Zealand and Australia in April 
 
 It is unclear which of their engagements he will be present at during their tour 
 
 Britain's Duke and Duchess of Cambridge have released a family photo with their son Prince George, a week ahead of their official visit to New Zealand and Australia. 
 
 It is just the third official official release of photos of Prince George and shows him with his parents aged eight months at their home in Kensington Palace, London. 
 
 The Duke of Cambridge, the second in line to the throne, is pictured with his wife and son looking out of an open window. The smiling duchess, 32, is holding Prince George on her knee as he focuses his attention on the family pet Lupo, a black cocker spaniel pictured sitting on the duke's lap. 
 
 Catherine is wearing white, while William, 31, looks relaxed in a shirt with the sleeves rolled up. George sports a light blue jumper with his name written on it, over a white collar. 
 
 The picture was taken by photographer Jason Bell, who also took the official photos for Prince George's christening, last October. 
 
 The family will be in New Zealand and Australia from April 7 to 25 but it's unclear what opportunities the public in both countries will have to glimpse the youngest royal in person. 
 
 "George being just a little over eight-months-old by the time they travel, I'm sure you will appreciate that the couple will have to make a final decision on those moments much closer to the time." 
 
 Prince George's first official photo was taken by his maternal grandfather, Michael Middleton . It showed Prince William and Catherine -- the latter holding Prince George swaddled in a white blanket -- on the lawn of her parents' home in Berkshire. 
 
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 New Zealanders may be hoping their country provides the backdrop for an updated version of that photo during the royal tour, after all, Prince William was recorded taking his first steps on the lawn of Government House in Auckland on his first visit, in 1983. 
 
 Royal itinerary 
 
 The Duke last visited New Zealand after the devastating 2011 earthquake in Christchurch. On this trip, the royal couple will visit the city together and stop to remember the 185 people killed. 
 
 As well as being Prince George's first visit Down Under, his mother Catherine will be making her debut. 
 
 "There's no hiding the enthusiasm for the visit by both the Duke and the Duchess. The Duke, because he has been before; and the Duchess because she has never been to either country but has wanted to do so as long as she can remember," Kensington Palace said in its earlier announcement. 
 
 The pair may not always be in complete agreement on their trip, however. 
 
 Kensington Palace said the Duke and Duchess were "just a little competitive" and some of the events on the itinerary will pit husband against wife. 
 
 The royal couple will board separate Team NZ America's Cup yachts for some informal racing in Auckland and coach rival teams in "rippa" rugby, a non-contact version of Rugby Union, in the South Island city of Dunedin. 
 
 A century after the outbreak of World War I, the tour will also see William and Kate paying tribute to both countries' war dead and visiting military bases. 
 
 Their last day will be April 25 -- ANZAC [Australian and New Zealand Army Corps] Day, which originally marked the landing of soldiers from both nations at Gallipoli, Turkey, in 1915. In the eight-month campaign fought there, 2,721 New Zealanders and 8,709 Australians died, before the allied forces withdrew. The day is now a tribute to those who have died in all conflicts. 
 
 The Duke and Duchess will plant a seed from a pine tree at the site of the battle at the Australian War Memorial in Australia's capital city, Canberra, before returning to London. ||||| Image copyright Jason Bell/Camera Press Image caption The Duke and Duchess of Cambridge and Prince George will begin the tour in New Zealand 
 
 An official photograph of Prince George with the Duke and Duchess of Cambridge has been released ahead of their tour of Australia and New Zealand. 
 
 The eight-month-old is pictured in his mother's arms while Prince William holds their dog, Lupo. 
 
 In the image, taken by royal christening photographer Jason Bell, the family is looking through an open window at their Kensington Palace home. 
 
 The Cambridges are due to arrive in New Zealand on 7 April. 
 
 They then fly to Australia on 16 April and their three-week tour ends on 25 April. 
 
 First tour 
 
 In the new image, the blond baby prince is wearing a pale blue jumper bearing his name, while his mother wears a cream-coloured blouse and his father a shirt with rolled-up sleeves. 
 
 Prince George, who is third in line to the throne, is not looking directly at the camera like his parents - instead, he is smiling at the black cocker spaniel next to him. 
 
 Other than a glimpse of the curtains, little of the Cambridges' renovated Kensington Palace home can be seen in the photograph. 
 
 It is the first official picture of Prince George to be released since his christening last October. 
 
 The visit to Australia and New Zealand will be his first official overseas tour. The trip echoes the Prince and Princess of Wales's visit to Australia and New Zealand in 1983 when the couple took William, then aged nine months, with them. 
 
 Image copyright PA Image caption Prince George was christened at the Chapel Royal in St James's Palace, London, in October 
 
 The tour will begin in Wellington, where the Cambridges will be greeted with a ceremonial welcome to New Zealand, called a Powhiri in Maori. 
 
 They will see a yacht race, visit a rugby stadium and a vineyard, and there will also be Maori engagements in Christchurch and Dunedin. 
 
 During their time in New Zealand, they will attend a ceremony in Blenheim to recognise the sacrifice of members of the Australian and New Zealand armed forces in the First World War. 
 
 There will be a similar commemorative ceremony in Canberra, Australia. 
 
 Their Australian itinerary includes visits to Uluru in the Northern Territory, as well as Sydney and Adelaide. 
 
 The duke and duchess will also visit an area of the Blue Mountains, New South Wales, that was hit by bushfires last October. 
 
 Their 11-strong entourage includes Prince George's new nanny, Maria Teresa Turrion Borrallo, and a hairdresser. 
 
 Celebrity photographer 
 
 Prince William has made a number of official trips to Australia and New Zealand in the past, but Catherine is yet to pay an official visit to either country. 
 
 The couple passed through Brisbane airport on their way back to the UK at the end of their South Pacific tour in September 2012, however. 
 
 The duke had paid an official visit to New Zealand and Australia in March 2011. He went to Christchurch shortly after it suffered an earthquake and also visited Queensland and Victoria, which had been hit by floods. 
 
 It is the third joint official trip abroad for the duke and duchess, following a visit to Canada and the US in July 2011, shortly after they were married, and their South Pacific tour. 
 
 Before taking official photographs following Prince George's christening at St James's Palace, Bell was known for his celebrity subjects. 
 
 His images from the christening included one of the young prince with his father, grandfather Prince Charles and great-grandmother, the Queen. ||||| Story highlights The baby will become fourth in line to the British throne 
 
 "The Queen and members of both families are delighted with the news," the palace says 
 
 As in her first pregnancy, Catherine is suffering from acute morning sickness 
 
 British Prime Minister David Cameron says he is "delighted by the happy news" 
 
 Another royal baby is on the way. 
 
 Britain's Duke and Duchess of Cambridge are expected to become parents for a second time, Buckingham Palace announced Monday. 
 
 "The Queen and members of both families are delighted with the news," the palace said. It didn't say when the due date will be. 
 
 As during her first pregnancy, Catherine is suffering from hyperemesis gravidarum, the palace said. The condition involves nausea and vomiting more severe than the typical morning sickness many women suffer during early pregnancy. 
 
 She is being treated by doctors at Kensington Palace and didn't accompany Prince William on a planned visit Monday to Oxford. 
 
 The decision to announce the pregnancy was made when it became apparent Catherine was not well enough to go on the Oxford trip and that a number of other forthcoming engagements could be affected, a royal source told CNN. 
 
 Royal baby: The new line of succession 
 
 30 photos: Will and Kate's royal family 30 photos: Will and Kate's royal family Britain's Prince William poses with Catherine, the Duchess of Cambridge, and their children, Prince George and Princess Charlotte, during a family Christmas photo released on Friday, December 18. Hide Caption 1 of 30 30 photos: Will and Kate's royal family Princess Charlotte plays with a stuffed dog in this photo taken by her mother in early November. Hide Caption 2 of 30 30 photos: Will and Kate's royal family William and Catherine pose with their children at Charlotte's christening in July. Hide Caption 3 of 30 30 photos: Will and Kate's royal family Princess Charlotte is seen with her big brother for the first time in a photo released by Kensington Palace in June. Hide Caption 4 of 30 30 photos: Will and Kate's royal family William and Catherine present their newborn daughter as they leave a London hospital in May. Hide Caption 5 of 30 30 photos: Will and Kate's royal family In March, William and Catherine visit a center dedicated to community learning in London. Hide Caption 6 of 30 30 photos: Will and Kate's royal family The royal family celebrates Prince George's first birthday with a trip to the Natural History Museum in July 2014. Hide Caption 7 of 30 30 photos: Will and Kate's royal family The royal family waves to a crowd before boarding a plance in Wellington, New Zealand, in April 2014. They went on a three-week tour of Australia and New Zealand. Hide Caption 8 of 30 30 photos: Will and Kate's royal family The royal couple attends the Tusk Conservation Awards at the Royal Society in London in September 2013. Hide Caption 9 of 30 30 photos: Will and Kate's royal family William and Catherine start an ultra marathon in Holyhead, Wales, in August 2013. It was Catherine's first public appearance since the birth of Prince George. Hide Caption 10 of 30 30 photos: Will and Kate's royal family The couple are pictured with their newborn boy, Prince George, in 2013. The new parents released two family photographs taken by Michael Middleton, Catherine's father. Hide Caption 11 of 30 30 photos: Will and Kate's royal family The Duke and Duchess and their newborn son depart St. Mary's Hospital in London in July 2013. Hide Caption 12 of 30 30 photos: Will and Kate's royal family In June 2013, William, Catherine and Prince Harry arrive at Westminster Abbey for a celebration marking the 60th anniversary of Queen Elizabeth II's coronation. Hide Caption 13 of 30 30 photos: Will and Kate's royal family In April 2013, Harry, Catherine and William make magic on the set used to depict Diagon Alley in the "Harry Potter" films. Hide Caption 14 of 30 30 photos: Will and Kate's royal family The couple attends a St. Patrick's Day parade as they visit Aldershot, England, in March 2013. Hide Caption 15 of 30 30 photos: Will and Kate's royal family In September 2012, the couple drank coconut milk from a tree that Queen Elizabeth II planted decades ago in the South Pacific nation of Tuvalu. Hide Caption 16 of 30 30 photos: Will and Kate's royal family Catherine and William celebrate during cycling events at the Olympic Games in London in August 2012. Hide Caption 17 of 30 30 photos: Will and Kate's royal family The Queen, William and Catherine stand on the balcony of Buckingham Palace during the finale of the Queen's Diamond Jubilee celebrations in June 2012. Hide Caption 18 of 30 30 photos: Will and Kate's royal family As part of their charity work, the couple attended a "healthy living cookery session" in London in December 2011. Hide Caption 19 of 30 30 photos: Will and Kate's royal family The newly married royal couple watches a rodeo demonstration at a government reception in Calgary, Alberta, in July 2011. Hide Caption 20 of 30 30 photos: Will and Kate's royal family Catherine shovels soil during a tree-planting ceremony in Ottawa in July 2011. Hide Caption 21 of 30 30 photos: Will and Kate's royal family You can feel the love as the happy couple attends a Snowbirds air show during Canada Day celebrations in July 2011. Hide Caption 22 of 30 30 photos: Will and Kate's royal family U.S. President Barack Obama and first lady Michelle Obama meet with the royal couple at Buckingham Palace in May 2011. Hide Caption 23 of 30 30 photos: Will and Kate's royal family The newlyweds walk hand in hand from Buckingham Palace the day after their wedding in April 2011. Hide Caption 24 of 30 30 photos: Will and Kate's royal family After their wedding on April 29, 2011, the couple drove from Buckingham Palace to Clarence House in a vintage Aston Martin. Hide Caption 25 of 30 30 photos: Will and Kate's royal family William and Catherine kiss on the balcony of Buckingham Palace after their wedding ceremony in London. Hide Caption 26 of 30 30 photos: Will and Kate's royal family The pair returned to their alma mater in St. Andrews, Scotland, in February 2011. They launched a fundraising campaign for a new scholarship. Hide Caption 27 of 30 30 photos: Will and Kate's royal family The couple poses for photographers to mark their engagement in November 2010. Catherine received the engagement ring that belonged to William's late mother, Diana. Hide Caption 28 of 30 30 photos: Will and Kate's royal family The couple cheers on the English rugby team during the Six Nations Championship match in London in February 2007. Hide Caption 29 of 30 30 photos: Will and Kate's royal family The couple takes a photo after graduating from the University of St. Andrews in June 2005. They met at school and even shared a house with others while students. Hide Caption 30 of 30 
 
 16 photos: House of Windsor babies 16 photos: House of Windsor babies Prince George of Cambridge arrives with parents Prince William, Duke of Cambridge, and Catherine, Duchess of Cambridge, for his christening on October 23, 2013. Buckingham Palace announced on Monday, September 8, that a second baby is on the way for the royal couple. The child will become fourth in line to the British throne. Take a look through Queen Elizabeth's family line. Hide Caption 1 of 16 16 photos: House of Windsor babies Zara Phillips holds daughter Mia Grace, born in January, during horse race trials in July. Phillips, a granddaughter of Queen Elizabeth II, is the daughter of Princess Anne and a cousin of Princes William and Harry. She is married to rugby player Mike Tindall. Hide Caption 2 of 16 16 photos: House of Windsor babies Autumn Phillips, the wife of Peter Phillips, attends the Gatcomb Horse Trials in Minchinhampton, England, with daughters Isla and Savannah in September 2013. Peter Phillips is the oldest grandchild of Queen Elizabeth II and Prince Philip. Hide Caption 3 of 16 16 photos: House of Windsor babies Prince Edward, Earl of Wessex, and wife Sophie, Countess of Wessex, leave Frimley Park Hospital in Surrey, England, with their second child, James, Viscount Severn, in December 2007. Edward is the youngest son of Queen Elizabeth II and Prince Philip. Hide Caption 4 of 16 16 photos: House of Windsor babies Prince Edward and Sophie pose with their first child, Lady Louise Windsor, in January 2004. Hide Caption 5 of 16 16 photos: House of Windsor babies Sarah, Duchess of York, holds 1-week-old Princess Eugenie of York outside London's Portland Hospital in March 1990. She is the daughter of the Duchess of York and Prince Andrew, Duke of York, who is the son of Queen Elizabeth II and Prince Philip. Hide Caption 6 of 16 16 photos: House of Windsor babies Prince Andrew, Duke of York, and Sarah, Duchess of York, with their 2-week-old daughter Princess Beatrice at Balmoral Castle in Scotland in August 1988. Hide Caption 7 of 16 16 photos: House of Windsor babies Prince Charles, Princess Diana and 3-month-old Prince Harry at St. George's Chapel in Windsor, England, in December 1984. Charles is the eldest son of Queen Elizabeth II and Prince Philip. Hide Caption 8 of 16 16 photos: House of Windsor babies Prince Charles and Princess Diana with their oldest son, Prince William, on a royal tour of Australia in November 1982. Hide Caption 9 of 16 16 photos: House of Windsor babies Princess Anne leaves St. Mary's Hospital in London with 3-day-old Zara Phillips in May 1981. Anne is the only daughter of Queen Elizabeth II and Prince Philip. She was married to Mark Phillips from 1973 to 1992. Hide Caption 10 of 16 16 photos: House of Windsor babies Members of the royal family with Peter Phillips after his christening in December 1977. Phillips is the son of Princess Anne, seen holding him, and Capt. Mark Phillips and the grandson of Queen Elizabeth II, center, and Prince Philip. Hide Caption 11 of 16 16 photos: House of Windsor babies Queen Elizabeth II and Prince Andrew with newborn Prince Edward, the queen's fourth child, in Buckingham Palace's music room in June 1964. Hide Caption 12 of 16 16 photos: House of Windsor babies Queen Elizabeth II holds newborn Prince Andrew in the music room of Buckingham Palace in March 1960. Prince Charles, from left, Prince Philip and Princess Anne are by her side. Hide Caption 13 of 16 16 photos: House of Windsor babies Then-Princess Elizabeth with Prince Charles and newborn Princess Anne in September 1950. Hide Caption 14 of 16 16 photos: House of Windsor babies Then-Princess Elizabeth holds son Prince Charles after his christening at Buckingham Palace in December 1948. Hide Caption 15 of 16 16 photos: House of Windsor babies The future King George VI and Queen Mother with their daughter Elizabeth, now queen, at her christening in May 1926. Hide Caption 16 of 16 
 
 Why does the 'spare heir' matter? 
 
 "The couple only found out very recently. The Duchess has not even reached the crucial 12-week stage," the source said. 
 
 William told reporters in Oxford that the couple were thrilled and Catherine was "feeling OK." 
 
 "It's been a tricky few days," he said. "We're hoping things settle down soon and she feels better." 
 
 The couple's first child, Prince George, was born in July 2013. 
 
 The second child will become fourth in line to the British throne. 
 
 Prince Charles is first in line, followed by William, Prince George and then eventually the new baby. The new child will knock future uncle Prince Harry down to fifth. 
 
 British Prime Minister David Cameron was among those quick to welcome the royal announcement. 
 
 "Many congratulations to the Duke and Duchess of Cambridge," he tweeted. "I'm delighted by the happy news that they're expecting another baby." 
 
 Read: Prince George turns 1: Five things to know 
 
 Read: Royal baby name: The history behind George Alexander Louis
– Ahead of their Australia-New Zealand tour next week, Prince William and Kate Middleton have released an official family photo that includes their now 8-month-old bouncing baby boy, reports the BBC. Prince George, who will accompany the royal couple on their trip beginning next Monday, is pictured being held by his mother in an open window at the royals' residence in Kensington Palace; William and the family pooch, Lupo, are at right in the image the palace says was taken by George's christening photographer, Jason Bell. As for the youngest royal's official duties on the Australia-New Zealand trek, well, it's up in the air, as per a palace statement via CNN: "George being just a little over eight months old by the time they travel, I'm sure you will appreciate that the couple will have to make a final decision on those moments much closer to the time." They will head out with an entourage of 11, notes the BBC, including a nanny and hairdresser.