LOS ANGELES -- Justin Bieber's week just got a little bit better.
The teen star was the big winner at the American Music Awards, as the show celebrated its 40th anniversary in style Sunday night at Nokia Theatre in Los Angeles, with a star-studded line-up of performers.
Usher opened the show with a dance-filled number, but he lost the first award of the night, Favorite Male Artist -- Pop/Rock, to his protegee, Bieber.
Bieber was nominated in two other categories -- Favorite Album -- Pop/Rock, and the big award of the evening, Artist of the Year.
Since this is the AMA's sixth year having the fans vote for their favorites online, it's easy to believe those who have the biggest social media presence would take home the trophies. And with more than 30 million followers on Twitter, that would be Bieber.
Sure enough, Bieber took home all three awards he was nominated for, which nearly rendered him speechless.
"I can't even think, I'm just so blown away right now," Bieber said as he turned to face his emotional mom who came on stage with him to accept the award for Artist of the Year. "I'm at a loss for words. I just want to say it's hard growing up with everyone watching me and I want to say that as long as you keep believing in me ... I'll always make you proud.
It was a good way for the young star to end what's said to have been a rough week as he's dealing with a rumored break-up with girlfriend Selena Gomez, who was spotted with Bieber outside the theater after the awards.
Gomez' close friend Taylor Swift was in attendance and took home yet another award for Favorite Female Artist -- Country, to add to her growing collection, which is bound to only grow larger with her new album, "Red," such a hit.
But to top off Swift's evening, she had easily one of the best performances of the night with the debut of her song "I Knew You Were Trouble."
The set was gorgeous with a large staircase and she had a lot of dancers to help with the energy the song permits. Though she started the performance off in a rather conservative dress, a costume change on stage left her in a more sexy, edgy outfit that seems to coincide with the new image on "Red."
But she wasn't the only country star in attendance. Luke Bryan won his first AMA for Favorite Male Artist -- Country. And Carrie Underwood, who performed the new song "Two Black Cadillacs" off her album "Blown Away," picked up an award for Favorite Female Artist -- Country.
Nicki Minaj beat out the boys to win both Favorite Rap/Hip-Hop Album and Favorite Rap/Hip-Hop Artist.
And with her performance of "I Feel Free" she showed she's not just a great rapper but she can actually sing. It was a more vulnerable Minaj than we've seen in her other performances, especially when a choir joined her on stage.
But it wasn't the last the audience saw of Minaj as she joined Bieber for "Beauty and the Beat," which followed his performance of "As Long As You Love Me."
P!nk's rendition of "Try" was not only impressive thanks to her singing abilities but also her dance skills, as it was jam-packed with contemporary choreography.
Newbie Carly Rae Jepsen beat out boy band One Direction, thought by many to be a shoe-in, for the New Artist of the Year Award.
After her win, backstage, she said while her song "Call Me Maybe" makes so many others happy, the number that currently makes her break out into song is Take That's "When We Were Young." And despite her newfound fame requiring up to four plane trips a day, she says it's worth it.
"The amount of work and travel involved ... but it's gratifying work, I'm not complaining," Jepsen said, of what she has found to be the biggest surprise of being a pop star.
In a more somber moment of the show, Ryan Seacrest introduced Stevie Wonder for a tribute to the late Dick Clark, who created the American Music Awards in 1973. Photos of the legend were shown on a large screen as Wonder performed a medley of songs including "Master Blaster (Jammin')," "My Cherie Amour" and "Sir Duke (You Can Feel It All Over)."
In a statement before the show, Seacrest said, "I am honored to be a part of the AMA's tribute to Dick Clark. He was a mentor, friend and a wonderful advocate for popular music, helping make it one of the cornerstones of American culture. We miss him dearly."
Everyone in attendance was on their feet during for the tribute performance, including Clark's widow, Kari Wigton, who was singing along.
But the show quickly turned upbeat again when PSY closed the show with his hit song "Gangnam Style" with the help of M.C. Hammer.
Their dance was a hit among the audience with people all over the auditorium joining in and those backstage erupting into applause as the song was complete.
Also backstage, Bryan joked that they stole that style of dance from the country world. Are we going to be seeing a "Gangnam two-step" in the future?
Who knows? But it was a brilliant collaboration to end the 40th anniversary show on an upbeat note.
2012 AMERICAN MUSIC AWARDS WINNERS
ARTIST OF THE YEAR
NEW ARTIST OF THE YEAR
Carly Rae Jepsen
FAVORITE MALE ARTIST - POP/ROCK
FAVORITE FEMALE ARTIST - POP/ROCK
FAVORITE BAND, DUO OR GROUP - POP/ROCK
FAVORITE ALBUM - POP/ROCK
Justin Bieber / "Believe"
FAVORITE MALE ARTIST - COUNTRY
FAVORITE FEMALE ARTIST - COUNTRY
FAVORITE BAND, DUO or GROUP - COUNTRY
FAVORITE ALBUM - COUNTRY
Carrie Underwood/ "Blown Away"
FAVORITE ARTIST - RAP/HIP-HOP
FAVORITE ALBUM - RAP/HIP-HOP
Nicki Minaj/ "Pink Friday: Roman Reloaded"
FAVORITE MALE ARTIST - SOUL/R&B
FAVORITE FEMALE ARTIST - SOUL/R&B
FAVORITE ALBUM - SOUL/R&B
Rihanna/Talk That Talk
FAVORITE ARTIST - ALTERNATIVE ROCK
FAVORITE ARTIST - ADULT CONTEMPORARY
FAVORITE ARTIST - LATIN
FAVORITE ARTIST - CONTEMPORARY INSPIRATIONAL
FAVORITE ARTIST - ELECTRONIC DANCE MUSIC (EDM)