Kelly Clarkson performed her pop smash 'Mr. Know It All' at the 2011 American Music Awards Sunday (Nov. 20) in Los Angeles. The pop starlet added a little twist to the original version by jazzing it up blaring trumpets and tickling piano chords. It was a nice change of pace from her usual pop sound.

The 29-year-old songbird looked like a full-figured Jessica Rabbit onstage with her sparkling red dress that showed a little cleavage as photographers were flashing their cameras and dancing to the big-band song. Clarkson looked so stunning in her dress that it left Travie McCoy's mouth wide open. Clarkson certainly added some pizzazz to her Top 10 hit.

We are quite sure Clarkson won't be wearing this luxurious red outfit when she embarks on her 'Stronger' tour dates next year. The trek kicks off Jan. 13 in Mashantucket, Conn. and wraps up April 10 in San Diego, Calif.

The 2011 American Music Awards got all jazzed up thanks to Kelly Clarkson.

Watch Kelly Clarkson Perform 'Mr. Know It All' at the 2011 American Music Awards