The identities of the X Factor celebrity duets have been revealed.
Christina Aguilera, Robbie Williams, Rihanna and Black Eyed Peas star will.i.am are to perform with the contestants during the final.
Rihanna is to pair up with hot favourite Matt Cardle, while Robbie will put his boyband experience to good use with One Direction.
Christina is to sing with Rebecca Ferguson and Cheryl Cole's close friend will.i.am will team up with her act Cher Lloyd.
Matt, Cher, Rebecca and One Direction will compete for the X Factor crown on Saturday and Sunday night on ITV.
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