All six remaining acts will sing tracks by either GaGa or Queen on Saturday night.
© Rex Features / Richard Young
The X Factor famously had a Queen week on the 2009 series, which featured Jedward covering 'Under Pressure', Danyl Johnson tackling 'We Are The Champions' and Olly Murs covering 'Don't Stop Me Now'.
Eventual winner Joe McElderry covered 'Somebody To Love'.
Lady GaGa is the special guest performer on this Sunday's results show, so she will be able to give her verdict to the finalists on their performances.
It is still not known whether a previous contestant will be allowed to return this weekend to replace the axed Frankie Cocozza.
The X Factor airs on Saturday at 8.15pm on ITV1.
