The ITV1 show will draw to a close in two weeks and The Killers will also appear on stage, along with BRITS Critics Choice 2013 winner Tom Odell.
X Factor judge Gary Barlow will even sing for both the live audience and viewers at home, teaming up with Elton to perform their new duet 'Face To Face'.
The final weekend will kick off with The Killers and Tom rocking out on the Saturday night. Smash hit US band The Killers will perform some of their best loved hits, including 'Human' and 'Mr Brightside'.
Gary, Elton, Katy and former X Factor stars One Direction - made up of Harry Styles, Liam Payne, Niall Horan, Louis Tomlinson and Zayn Malik - will then show us what they're made of on the Sunday night - before the winner of this year's series is announced.
Last night, Tamera Foster was sent home, leaving Luke Friend, Nicholas MacDonald, Rough Copy and Sam Bailey in next week's semi final.
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