Rihanna, Robbie Williams, Will.I.Am, Christina Aguilera For X Factor Final

Rihanna, Robbie Williams, Will.i.am and Christina Aguilera are all set to perform on this weekend's X Factor final.

The four artists will perform duets with the remaining contestants in the battle for the X Factor crown.

Black Eyed Peas Frontman Will.i.am is rumoured to be appearing alongside Cheryl Cole's act Cher Loyd, according to one tabloid report.

Meanwhile, The X Factor finalists have taken the top spot in the UK singles chart for a second week running with their charity single 'Heroes'.

They are also favourite to top the UK singles chart at Christmas.

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