America's rising pop-star, Justin Bieber, last night claimed four awards at the American Music Awards in the Los Angeles' Nokia Theater.

I can't stop smiling," the swoosh-haired singer proclaimed. "This is amazing. I don't know how this is possible!"

The young star nabbed awards for Favorite Male Pop/Rock Artist, Favorite Pop/Rock Album for "My World 2.0," T-Mobile Breakthrough Artist of the Year and  Artist of the Year.

Bieber is the youngest singer to ever win the Artist of the Year award.

"I've been singing Eminem since I was 3, and Usher's my mentor," Bieber said

He also paid tribute to the Kind of pop: "And I wanna thank Michael Jackson, because without Michael Jackson none of us would be here."

Rihanna, sporting new long red locks scooped the award for Favorite R&B Female Artist. The singer arrived at the ceremony sporting an Eighties' style, shoulder length perm, wearing a stunning Elis Saab backless gown.

Both Christina Aguilera and Katy Perry also donned a variety of stunning costumes on stage for their performances.

Christina Aguilera was surrounded by dancers on a set which mimicked a Burlesque club for her performance. While Katy Perry descended from star to sing "Firework", the latest single from her platinum selling album "Teenage Dream". The new Mrs Russell Brand was dressed in a sparkly, figure hugging, red catsuit.

Other performers on the night included, Miley Cyrus, Taylor Swift, Pink and Kesha.

Winners of the 2010 American Music Awards include:

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