Robbie Williams and Sir Paul McCartney will both appear on the final of The X Factor this weekend, it's been reported.
George Michael and Michael Buble are also understood to have agreed to perform on the ITV show.
According to the Daily Mirror, Williams, whose last appearance on the programme in September shocked fans, will duet with finalist Olly Murs on Saturday.
Michael, meanwhile, will perform with Joe McElderry, while Buble will team up with 20-year-old mother Stacey Solomon.
It is thought that Sir Paul will perform solo during the final programme in the series on Sunday.
A source told the newspaper: “This has all the makings of the biggest X Factor show ever. It will be the only thing people will be talking about at work on Monday.”
Both Williams and Buble have already featured in the current series of the reality show, but the final will mark Sir Paul and Michael's first appearance.
The contestants are battling it out once again to win a lucrative record deal.
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