For the first time this series, the fate of the remaining acts - Misha Bryan, Amelia Lily, Marcus Collins and Little Mix - will be decided by public votes alone, with only three advancing to the Wembley Arena final on Saturday, December 10.
Of the four acts, only Lily and Misha B have finished in the bottom two before, with the latter being saved by judges a total of three times throughout the show.
It was announced yesterday (December 1) that this weekend's X Factor will feature the themes 'Motown' and 'The Song To Get You To The Final'.
X Factor judge Kelly Rowland and Justin Bieber will perform at this weekend's result show.
The X Factor semi-final airs Saturday (December 3) at 8pm on ITV1.
> 'X Factor' final four play Talk Talk London secret gig - In pictures
> 'X Factor' Final Four: Who should win?