X Factor duets revealed

Rihanna, Christina Aguilera, Will.I.Am and Robbie Williams have been lined up to sing with the X Factor finalists this week.

The tabloids have reported this information, but has yet to be confirmed who will sing with who.

Though it is rumoured that Dannii Minogue is desperate for Matt Cardle to sing with Christina Aguilera.

The Dirty star is set to also be singing a song from her new film Burlesque.

An X Factor insider has told the papers: “A duet between Christina and Matt would be a magical moment – just like when Beyonce dueted with Alexandra Burke during 2008's final.

“Matt's voice is phenomenal and Christina can hit noted no one has dreamed of. They would be a perfect pairing no matter what song they sang.”

It has been rumoured that Will.I.Am is set to sing with teen rapper Cher.