US R&B star Rihanna will perform with X Factor band JLS on this weekend's final, according to reports.

Both acts will together perform a cover of Rihanna's hit single 'Umbrella', which brought her to the world's attention last year.

Westlife will perform with favourite Alexandra Burke, while Eoghan Quigg will team up with Boyzone on the final this Saturday (December 13th).

According to the Daily Mirror, odds on JLS winning the show have been slashed after it emerged they would be performing with Rihanna.

The band, who covered 'Umbrella' earlier in the series, are now 7-2 second favourites.

Last year, Leon Jackson's victory on the talent contest was credited to his duet with Kylie Minogue on the live final.

(by Jason Gregory)