Saturday night's 'X Factor' will also feature performances from Ed Sheeran and 'All About That Bass' singer Meghan Trainor.
Sunday's show will see Sam Smith and One Direction taking to the stage.
The final three
At present, Fleur is the favourite to win the competition and her performance of ‘Uptown Funk’ resulted in Mark Ronson and Bruno Mars rush-releasing their original version of the track.
Take That have already performed on ‘X Factor’ once this series, though Simon Cowell wasn’t exactly impressed by their rendition of their latest single ‘These Days’.