Taylor Swift, Justin Bieber and Willow Smith at the American Music AwardsJustin Bieber took home four huge awards -- including the coveted Artist of the Year -- at the 2010 American Music Awards.

Last night at the Nokia Theatre in Los Angeles, Bieber also took home the T-Mobile Breakthrough Artist title, Favorite Male Artist and Favorite Album for 'My World 2.0'.

Taylor Swift won her third American Music Award for Favorite Female Country Artist and added a bit of edge to her good girl country style, debuting blunt bangs and straighter locks.

But the talk of the AMA red carpet was Willow Smith, whose outfit featured a bizarre, belted-on yellow shoulder-sleeve, black leather gloves and slouchy boots.