Many of today’s stars have all gathered at the Nokia Theater in Los Angeles, California for the 2012 American Music Awards. The 40th annual show kicked off will none other than Usher, who brought the stage to life performing a medley of “Numb,” “Climax,” and “Can’t Stop, Won’t Stop.” Nicki Minaj, who earlier won the award for “Favorite Rap/Hip-Hop Album,” turned the AMA stage into a winter wonderland as she performed her reflective single “Freedom.”

Watch performances from Usher, Nicki Minaj, Justin Bieber, Swizz Beatz with Chris Brown and Ludacris, Stevie Wonder, and PSY with MC Hammer after the jump…..

PSY & MC Hammer – “Gangnam Style” and “Too Legit 2 Quit”

Usher – “Numb,” “Climax,” and “Can’t Stop, Won’t Stop” Medley

Nicki Minaj – “Freedom”

Justin Bieber – “As Long As You Love Me” & “Beauty and a Beat” with Nicki Minaj

Swizz Beatz, Chris Brown & Ludacris – “Everyday Birthday”

Stevie Wonder – “My Cherie Amour,” “You Are The Sunshine of My Life,” “Sir Duke” Medley (Dick Clark Tribute)

Thanks to IdolxMuzic

Previously: Nicki Minaj, Chris Brown, Mary J. Blige & Drake Perform at the 2011 American Music Awards (Video)