AMA's Big Winner: a Canadian

The big winner at last night's American Music Awards was ... a Canadian. Justin Bieber won artist of the year, which he also grabbed in 2010, as well as favorite pop/rock male artist and favorite pop/rock album. "I want to say this is for all the haters who thought I was just here for one or two years," said a triumphant Bieber as he accepted his first award. "I feel like I'm going to be here for a very long time." He also brought his mom onstage as he collected his last award, grinded with Nicki Minaj during a performance, and got his butt grabbed by presenter Jenny McCarthy. Other highlights, per the AP:

• Usher opened the show by performing a medley of his hits, and won favorite soul/R&B male artist.
• It wouldn't be an awards show if Taylor Swift didn't win something. This time around she walked away with a fifth straight win in the favorite country female artist category.
• Nicki Minaj won two awards (favorite rap/hip-hop artist and favorite rap/hip-hop album), wore three wigs, and changed into four different outfits.
• Korean rapper PSY teamed up with MC Hammer to perform a mashup of their hits, "Gangnam Style" and "Too Legit to Quit," as everyone in the audience horse-danced along.
• Favorite new artist went to Carly Rae Jepsen of "Call Me Maybe" fame.
• Ryan Seacrest offered a tribute to AMA creator Dick Clark as Stevie Wonder performed.

Click for the complete list of winners or check out photos from the night. (More American Music Awards stories.)