updated 11/21/2010 AT 11:00 PM ET
•originally published 11/21/2010 AT 11:30 PM ET
It’s sweet being 16 – especially for Justin Bieber.
The teen idol dominated the American Music Awards on Sunday, winning four trophies to go with ear-piercing squeals from the girls at L.A.’s Nokia Theatre.
“I can’t stop smiling,” says Bieber, who won for pop/rock male, breakthrough artist, album of the year for My World 2.0 and artist of the year.
In becoming the youngest artist to win the top AMA honor, Bieber invited Usher to the stage, calling the R&B star “not only my mentor but my best friend and my big brother.”