Kelly Clarkson Performs ‘Mr. Know It All’ on ‘Tonight Show’ (VIDEO)

| September 21, 2011 - 11:30 am

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In one of her first performances since announcing her new album, American Idol alum Kelly Clarkson showed up on The Tonight Show with Jay Leno Tuesday to perform her newest hit single “Mr. Know It All.”

Stunning in a black sequin, off-the-shoulder dress, she once again delivered her signature, heart-wrenching vocals into living rooms of America. As we all know, the American Idol starlet needs no lip-syncing!

Lyrics to this song include “you don’t know a thing about me,” so could this song be directed to a former beau? Sound off in the comments!

This is the first on-air performance of the new single from her album, Stronger, which will be released in stores and online retailers October 24.