In November 2011 "Don't Worry Be Happy", a pop song Sebastian wrote after encountering an angry motorist in Los Angeles, was released as the lead single of his seventh album "Armageddon". It peaked at number five and reached 4× platinum certification. Sebastian spent time in the US in early 2012 working on the album, and "Gold", an uptempo soul track, was released as the second single in May. It peaked at number ten, gaining platinum certification. Sebastian toured nationally during June and July to showcase new songs. In 2012, Sebastian appeared as a judge on "The X Factor" for a third and final year (until 2015). He was given the Over 25s, and was assisted in selecting his final three by Alicia Keys. His contestant Samantha Jade was the winner. "Armageddon"'s third single "Battle Scars", an R&B ballad featuring a hip hop rap by Lupe Fiasco, was released in August. It debuted at number one, Sebastian's sixth number one single in Australia. He has the most number one singles for an Australian male artist in Australian music history, and is third overall for all Australian acts. Only Kylie Minogue and Delta Goodrem have achieved more. "Battle Scars" was the third-highest selling single in Australia in 2012 and the highest-selling single by an Australian act. It reached 11× platinum in 2019. "Battle Scars" also reached number two and double platinum certification in New Zealand.