Justin Bieber: AMAs 2012 Performance - Watch Now!

Justin Bieber gets down with Nicki Minaj as they perform at the 2012 American Music Awards held at Nokia Theatre L.A. Live on Sunday (November 18) in Los Angeles.

After picking up both the Favorite Pop/Rock Male Artist and Favorite Pop/Rock Album, the 18-year-old musician hit the stage.

PHOTOS: Check out the latest pics of Justin Bieber

He performed “Beauty and a Beat” with Nicki and “As Long As You Love Me,” off of his album, Believe.

Check out his performances below!

FYI: Justin wore custom-designed pants, tank and ball cap from Kemal + Karla and Justin Bieber for Adidas sneakers. 15+ pics inside…