We can't wait to talk to Taylor Swift, Justin Bieber and Selena Gomez (wonder if they'll hang together backstage and whether Justin will be able to behave in Las Vegas?), Nicki Minaj, Macklemore & Ryan Lewis, Christina Aguilera, Pitbull, Bruno Mars, Ed Sheeran, Miley Cyrus and more!
Need more star wattage? Jennifer Lopez will perform. Prince will perform and accept the Billboard Icon Award, and Madonna will be honored with the Top Touring Artist Award.
Before the backstage show, check out Cambio's live from the BLUE carpet coverage, right here at 6:30 p.m PT. (Too bad Usher rocked his bright blue suit a year too early!)
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Gallery | 2013 Billboard Music Awards Nominees!