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Justin Bieber swept the 2012 American Music Awards tonight, taking top categories Artist of the Year, Best Pop/Rock Male Artist and Best Pop/Rock Album.

Katy Perry was his female counterpart in the Pop/Rock category, while maroon 5 won for best Pop/Rock group.

Everyone's favorite scorned lover, Taylor Swift, took the prize for Best Country Female Artist, while Luke Bryan took the male award.

Nicki Minaj was the only artist besides Beiber to win more than one award -- she took Best Rap/Hip-Hop Aritst and Best Rap/Hip-Hop Album for Pink Friday: Roman Reloaded.

Beyonce and Usher won the prizes for Best Soul/R&B Artists and Rihanna won Best Soul/R&B Album for Talk That Talk.

Click through to see the full list of winners ...

Jennifer Lopez was not only a winner at the American Music Awards ... but also on the red carpet. The sexy and single Latina looked fit and phenomenal in a fringed mini dress. Oh my, look at those legs! Marc Anthony eat your heart out!

Vanessa Lachey (yes, she changed her name!) hosted the pre-show, and while her hubby Nick stayed home, the brunette bombshell looked understated, yet elegant in white.

Others who wowed for different reasons ... Audrina Patridge in a cleavage baring mini (really??) and Heidi Klum who strutted the carpet in a foil-looking ensemble.

Tim Ogier/ABC

Jennifer Lopez picked up the prize for Favorite Latin Music Artist Sunday night at the American Music Awards.

Lopez also performed her sexy single "Papi" and joined fellow Latin Music Artist nominee Pitbull for her hit single "On The Floor."

Meanwhile, her soon-to-be ex, Marc Anthony, also hit the stage with collaborator Pitbull to perform "Rain Over Me."

Despite sharing the same space and sharing hit producer Pitbull, J Lo and Marc Anthony seemed to successfully avoid each other ... including Lopez's avoidance of Marc's name in her acceptance speech.

She thanked her family and her long-time manager Benny Medina, but even as she struggled to find her next words, the name "Marc," never popped into her mind ... or at least not out of her mouth!

Tim Ogier/ABC

He may have lost out on winning an American Music Award this year, but at least Justin Bieber had gorgeous girlfriend Selena Gomez on hand to comfort him!

Presented by his friend and collaborator, Sean Kingston, the "Baby" singer took to the stage to perform his festive hit single "Mistletoe," from the chart-topping Christmas album, "Under the Mistletoe", while wearing an all-white leather motorcycle outfit.

Justin also helped close down the awards show with LMFAO, as they performed their hit “Party Rock Anthem” while showing off some killer dance moves.

You're still a winner in our eyes, JB

Tim Ogier/ABC

Kicking off the 39th Annual American Music Awards with an electrifying performance of "Turn Me On" and "Super Bass", Nicki Minaj got the show off to a rockin' start, with the help of American Idol alum, David Guetta.

The pink haired rapper later ditched her metal wear for a bright green ball gown skirt and black lace bodice to pick up her awards for Favorite Hip Hop Artist and Favorite Hip Hop Album.

Also in attendance? Little Sophia Grace Brownlee, the 8-year-old who received worldwide attention after taping her own cover of “Super Bass,” and posting it on YouTube. The budding rapper was there to interview the stars for The Ellen DeGeneres Show!

We thought it wouldn't happen ... Adam Lambert was BACK at the AMA's tonight after his controversial 2009 performance had reportedly had him banned from the show for life!

Turns out, the media had it wrong. After Lambert kissed his male bass player -- a move that was unscripted, said producers -- during his 2009 performance, ABC received more than 1500 calls from unhappy parents and conservative groups spoke out.

Meanwhile, the show's executive producer, Larry Klein, recently told The Hollywood Reporter, Lambert "was never banned from the show."

Klein went on to say: "That thing got so out of control and was just so out of left field. The kiss wasn't in the script. Did Adam rehearse it on his own and not tell us? I have no idea ... Adam was performing on a stage. Did he get carried away? Absolutely. Was he regretful afterward? Of course he was, but it's over. ABC never banned him and Dick Clark Productions never would."

Not one to wisk down the red carpet without being noticed, Adam spiked his hair as high as it's ever been, donned some sparkly silver pants and a vest, and strutted with the best of 'em, with boyfriend, Sauli Koskinen by his side.