Kelly Clarkson lights up the stage with her live medley.

Kelly Clarkson hit all the right notes as the hostess on Sunday's "Billboard Music Awards" on NBC.

She opened the show with a heartfelt speech about Friday's school shooting in her native Texas.  Then she smoothly transitioned to her hosting duties.  

Below, you can watch her perform a medley of hits, and you'll see she has come a long way from her start as a shy performer on season one of "American Idol" in 2006.  By the way, one of the guys who discovered her, Simon Cowell, showed up on stage Sunday to salute her. 

Watch Kelly here, and do you agree with me that it looks like comedian Ben Stiller is playing the guitar behind her? 

 

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