Kylie, Beyonce, George Michael – some of the music world's biggest names have duetted with the X Factor finalists.
And this weekend looks set to be no different.
The famous faces joining Matt Cardle, Rebecca Ferguson, One Direction and Cher Lloyd as they sing for the X Factor crown have been revealed.
According to the Daily Star, Christina Aguilera, Robbie Williams, Rihanna and Will.i.am will perform with the finalists in a bid to help them win the show.
It will be the second time that Robbie has supported one of the hopefuls.
He performed during last year's final show singing Angels with runner-up Olly Murs.
Many reports are linking the Take That star to favourite Matt. But his mentor Dannii is said to be keen he duets with Christina.
"A duet between Christina and Matt would be a magical moment – just like when Beyonce dueted with Alexandra Burke during 2008’s final," a source told the paper.
"Matt’s voice is phenomenal and Christina can hit notes no one has dreamed of.
"They would be a perfect pairing no matter what song they sang."
Photo: ę Rex