We're living in a nation of Beliebers. Justin Bieber went four-for-four at the American Music Awards Sunday night, including snagging a win in the top category, Artist of the Year.

Bieber, 16, also took home the awards for Pop/Rock Album, Pop/Rock Male Artist and Breakthrough Artist. "I can't stop smiling; this is amazing," he said after beating out Eminem and Usher. "Truly I don't know how this is possible because I've been singing Eminem since I was three and Usher is my mentor. So this is big." Last year's winner, Taylor Swift, took home the prize for Female Country Artist, saying "I just want to thank the fans."

The night included performances from winners Rihanna and the Black Eyed Peas, as well as by non-nominees like Kid Rock, Diddy and Pink. Ke$ha and Katy Perry both turned in spectacular shows with pyrotechnics, light-beam eyes and packs of dancers. –AMY LEE

See the full list of winners below:

Soul/R&B Album: Usher, Raymond v. Raymond
Soul/R&B Female Artist: Rihanna
Soul/R&B Male Artist: Usher
Pop/Rock Album: Justin Bieber, My World 2.0
Pop/Rock Band, Duo or Group: The Black Eyed Peas
Pop/Rock Female Artist: Lady Gaga
Pop/Rock Male Artist: Justin Bieber
Rap/Hip-Hop Album: Eminem, Recovery
Rap/Hip-Hop Male Artist: Eminem
Country Band, Duo or Group: Lady Antebellum
Country Album: Carrie Underwood, Play On
Country Female Artist: Taylor Swift
Country Male Artist: Brad Paisley
Contemporary Inspirational Artist: MercyMe
Soundtrack: Glee: The Music, Volume 3 — Showstoppers
Latin Music Artist: Shakira
Alternative Rock Artist: Muse
Adult Contemporary Artist: Michael Buble
Breakthrough Artist: Justin Bieber
Artist of the Year: Justin Bieber