They can do a lot more than merely judge a reality competition together.

At last night's American Music Awards, Adam Levine and Christina Aguilera anchored a rendition of their hit, "Moves Like Jagger," which had famous faces in the crowd up and dancing. Watch this duo belt out the track on stage now, as Jaden Smith, Selena Gomez, Taylor Swift and others groove to it while watching from the audience:

Posted in: Christina Aguilera

Give us Kelly Clarkson standing at a microphone, simply singing, and we'd be thrilled. The original American Idol possesses that kind of sheer talent.

But the artist took to the stage at last night's American Music Awards in a shiny, beautiful dress and was flanked by a series of brass instruments, along with back-up dancers that took their cue from the early 20th century musical Newsies.

Posted in: Kelly Clarkson