Kelly Clarkson Rocks AMAs With Big-Band Performance of ‘Mr. Know It All’ (VIDEO)

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Kelly Clarkson is known for her live performances, but even we were taken aback by her jazzy rendition of ‘Mr. Know It All’ at last night’s American Music Awards.

The Grammy-winning pop star added a touch of class to the show with a big-band-style performance of her top 10 hit, during which she also donned a sexy, Jessica Rabbit-esque dress. Suffice to say, she’s never looked better.

Kelly recently celebrated a victory at the Country Music Awards, where she won Musical Event of the Year for her duet with Jason Aldean, ‘Don’t You Wanna Stay.’

What did you think of Kelly’s performance? Watch it now, then voice your thoughts in the comments.