X Factor: Bruno Mars and Kelly Clarkson perform live! (VIDEOS)

X Factor 2011 set

US stars Bruno Mars and Kelly Clarkson made their debut appearances on The X Factor UK tonight as they performed their latest tracks on the show. In celebration of rock week, Kelly Clarkson performed her new song while the not-so-rocky Bruno Mars followed her onto the stage to perform his new track.

Former American Idol winner Kelly Clarkson performed new single Mr. Know It All accompanied by Irish drumming group Extreme Rhythm, while Bruno Mars wowed with Runaway Baby.

Watch Kelly Clarkson and Bruno Mars perform on The X Factor 2011 below...


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