Kelly Clarkson Has a Blast on The X Factor UK

Someone who knows a thing or two about singing competitions performed on The X Factor UK last night.

Kelly Clarkson - who won season one of American Idol, has sold 22 singles around the globe and garnered two Grammys - rocked out with a rendition of "Mr. Know It All," the lead single off her next album... which hits stores this week!

Kelly Clarkson - Mr. Know It All (X Factor UK)

Tweeted Clarkson after the performance:

"I just had such a fun time on X Factor in London!! Thank you to all of the "Extreme Rhythm" drummers, my band, and the production team! What a fun performance! All of the judges and the contestants I met were so sweet. I wish good luck to all of you! A special shout out to my favorite judge and Texas girl @KellyRowland and contestant @samibrooks."

The artist has given fans an early listen to a number of new tracks over the past week. We've collected each one in our Kelly Clarkson video section. Go watch now!