Sarah Harding participating in weekly Saturday night live performances (alternating weekly between the girls and boys). Each week the contestant polling the fewest phone votes was eliminated, until the final line-ups of the groups emerged. Harding joined Nadine Coyle, Cheryl Tweedy, Nicola Roberts, and Kimberley Walsh to comprise the new girl group Girls Aloud, formed through the show by a public vote on 30 November 2002. The group's debut single "Sound of the Underground" peaked at number one on the UK Singles Chart, becoming the 2002 Christmas number one. Girls Aloud hold the record for the shortest time between formation and reaching
Girls Aloud has also released "Girls on Film" and "Style". Official calendars have also been issued annually from 2004 to 2009, the only exception being 2005. Girls Aloud co-wrote an autobiography titled "Dreams That Glitter – Our Story". The book, named after a lyric in "Call the Shots", was published in October 2008 through the Transworld imprint Bantam Press. Before the release, OK! magazine bought the rights to preview and serialise the book. In 2007, Girls Aloud signed a £1.25m one-year deal to endorse hair care brand Sunsilk. The girls filmed a television advertisement and appeared in and magazine advertisements, with each