Talk about a star-studded line-up! Producers for the 2011 American Music Awards announced today that a host of A-list stars while be performing at the award ceremony next month; joining previously announced acts Katy Perry and Pitbull are Justin Bieber, Christina Aguilera, Kelly Clarkson, Maroon 5, and Mary J. Blige. The awards are set to be presented on Nov. 20 at the Nokia Theatre in Los Angeles.

Viewers can expect Aguilera to take the stage alongside Maroon 5 to perform their smash 'Moves Like Jagger' -- but we're crossing our fingers that the Biebz will take the opportunity to do a live performance of one of his many new Christmas ditties, like 'Mistletoe' (which has been stuck in our head all week). Nov. 20 is close enough to Christmas to get down with a little Bieber-style Yuletide cheer, right?

In an unusual move, the show won't be hosted (Jimmy Kimmel must be bummed) -- instead, various celebrities will introduce each act. The American Music Awards differ from ceremonies like the Grammys in that the winning acts are determined by a poll of music buyers, rather than by music industry insiders -- which makes the AMAs one of the more democratic award shows.

The awards will be broadcast live on ABC on Nov. 20. We'll be tuning in!