Since her 2006 win she has sold more than 20million records and has been nominated for seven Brit Awards and three Grammys.
2 Alexandra Burke: Her version of Hallelujah was the Christmas No1 in 2008 and she is on her third album.
3 JLS: Lost the final but won BRIT Awards and a total of five MOBO Awards.
4 Joe McElderry: Duetted with Carrie Underwood in The Chronicles of Narnia: The Dawn Treader.
5 Olly Murs: Lost the final to McElderry but his career has thrived.
6 Stacey Solomon: Carved out a TV career despite finishing third, she was crowned queen of the jungle.
7 Little Mix: The first band to win the show, their first album was the highest chart entrant by a girl band.
8 One Direction: Arguably the must successful X Factor act, they have broken sales records and had their own movie.
9 James Arthur: The winner in 2012, he has been dogged by online media controversies.
10 Rylan Clark: Has become a successful TV presenter and won Celebrity Big Brother in 2013.