Justin Bieber, Usher and Eminem won big at this year's American Music Awards at the Nokia Theater in Los Angeles last night (November 21).

Bieber led all winners with four awards, including Favorite Male Artist, Favorite Album, Artist of the Year and Breakthrough Artist. Biebz's mentor, Usher took two awards home. The R&B singer won Favorite Album and Favorite Male Album.

Eminem swept the rap categories by taking home Favorite Male Artist and Favorite Album. Rihanna, Black Eyed Peas and Lady Gaga also won awards. See the full list of winners below.

Pop or Rock Music

Favorite Male Artist
Justin Bieber

Favorite Female Artist
Lady Gaga

Favorite Band, Duo or Group
The Black Eyed Peas

Favorite Album
Justin Bieber, "My World 2.0"

Country Music
Favorite Male Artist
Brad Paisley

Favorite Female Artist
Taylor Swift

Favorite Band, Duo or Group
Lady Antebellum

Favorite Album
Carrie Underwood, "Play On"

Rap/ Hip-Hop Music
Favorite Male Artist
Eminem

Favorite Album
Eminem, "Recovery"

Soul/ Rhythm & Blues Music
Favorite Male Artist
Usher

Favorite Female Artist
Rihanna

Favorite Album
Usher, "Raymond v. Raymond"

Soundtracks
Favorite Album
"Glee: The Music, Volume 3 Showstoppers"

Alternative Rock Music
Favorite Artist
Muse

Adult Contemporary Music
Favorite Artist
Michael Bublé

Latin Music
Favorite Artist
Shakira

Contemporary Inspirational
Favorite Artist
MercyMe

Artist of the Year
Justin Bieber

T-Mobile Breakthrough Artist
Justin Bieber