Rihanna X-Factor VIDEO

Rihanna shook things up this week with a big performance on the smash hit UK show, X Factor, which will soon make its American debut.

Rihanna was one of several stars who took to the stage with the show's contestants to sing their hits. Rihanna sang "Unfaithful" along with finalist Matt Cardle, while Christina Aguilera teamed up with another contestant, Rebecca Ferguson, to do her classic smash hit Beautiful.

Matt Cardle and Rihanna Fenty were said to have some very good chemistry, and even some surprising flirtation going on as they gave there first rate concert performance. Rihanna has been setting the charts on fire with her singles and albums, and her CDs and iTunes downloads continue to to soar. She will also make a dent in the Grammys through her collaboration with Eminem on "I Love The Way You Lie."

Rihanna X-Factor VIDEO
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First up to sing was Matt Cardle who did a duet with R&B star Rihanna and sang her hit song 'Unfaithful.' This pairing worked well, and have to say there was a bit of flirtatious fun going on as well, but all within the confines of fun. Next up was Rebecca Fergusan, who was paired up with Christina Aguilera, with the pair performing her song "Beautiful." Again the performance was pretty good, but I couldn't help but feel that Rebecca was a little overwhelmed by it all, but covered fairly well. Third up was the pairing of One Direction did a duet with Take That and solo singer Robbie Williams, performing his huge hit 'She's The One'

Rihanna X-Factor VIDEO