Justin Bieber's AMAs Performance 2012 - Watch Now!

Justin Bieber serenades the crowd with his hit song “As Long As You Love Me” during the 2012 American Music Awards held at Nokia Theatre L.A. Live on Sunday (November 18) in Los Angeles.

After the acoustic performance, the 18-year-old singer was joined by Nicki Minaj while they performed their new single “Beauty and a Beat.”

PHOTOS: Check out the latest pics of Justin Bieber

Earlier in the night, Justin won Favorite Pop/Rock Male Artist and Favorite Pop/Rock Album for his recent album Believe.

FYI: Justin is wearing a black leather tank, red leather pants, and a ball cap custom designed by Kemal + Karla with Justin Bieber for Adidas sneakers.