Nicki Minaj kept her look more demure than usual, but still brought her eclectic energy to the red carpet in a lime green Monique Lhuillier gown and massive blonde wig. The "Starships" singer's '80s look was perfectly complemented with a bolt of hot pink matte lipstick. Later in the show, Minaj switched into a pink wig and then opted for a black 'do as she joined Justin Bieber onstage for "Beauty and the Beat."

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Justin Bieber looked more "swaggy" than usual at the AMAs in a black leather tank and drop-crotch pants by Kemal + Karla, a black Dior Homme cardigan, a Loree Rodkin bracelet and spiked red loafers by Unif. Bieber's hottest accessory, however, was his mom, Pattie Mallette, who escorted him down the red carpet. The Biebs later received the night's top award, for Artist of the Year.

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Carly Rae Jepsen looked like a modern-day princess in a sparkling, pale pink Gomez Garcia dress, Edie Parker clutch, Brian Atwood shoes and Effy jewelry. The Canadian singer later rocked a more casual, all-white look as she performed her new single, "This Kiss."

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Is that Ke$ha or Grace Kelly making her way down the red carpet? The "Die Young" singer continued to shine at the 2012 AMAs, flaunting her ultra-feminine transformation in a pastel lace mini-dress, black suede pumps and pin-up-worthy platinum blonde hair. But it wasn't all glamourous -- Ke$ha kept a trace of her former grunge style with a pair of gold insect-studded earrings.

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Linkin Park's Chester Bennington and Mike Shinoda looked sharp in ties and blazers at the 40th American Music Awards in L.A.

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Jordin Sparks and Jason Derulo get cozy on the red carpet at the 40th American Music Awards in Los Angeles.

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Will.i.am took a cue from Justin Bieber on the AMAs red carpet, in tight leather pants and jazzed-up kicks.

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Cyndi Lauper channeled her inner Gwen Stefani in a leather and red plaid frock and cutout leggings at the 2012 American Music Awards.

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Red carpet co-host Lance Bass took his own turn walking the scarlet lane in a metallic blue suit at the 40th American Music Awards.

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Country star Luke Bryan gets out-glammed by his wife Caroline, who looked gorgeous on the AMAs red carpet in a trailing sapphire gown.

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Sean Kingston, who also showed off a new video during the preshow, stands modestly on the red carpet of the 40th American Music Awards held in Los Angeles.

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Model/TV personality Heidi Klum showed some skin in a decadent gold mini-dress and matching heels at the 2012 AMAs.

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Phoebe Price stood out on the AMAs red carpet in a beaded, gold gown and metallic dark gold jacket.

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PSY showed off his "Gangnam Style" dance as usual on the AMAs red carpet, in a fitted leather blazer and glittering black pants.

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Taylor Swift showed off her legs and brought a golden glow to the carpet in a long-sleeved Zuhair Murad metallic dress, darling Neil Lane gold floral earrings, and sparkling Jimmy Choo heels.

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Crhis Brown sported a casual look at the 2012 AMAs in black leather pants, a black hoodie and a leather jacket, white high-top kicks and golden shades.

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Brandy glittered in a multi-layer dark gold gown and a pin-up hair 'do at the 2012 American Music Awards.

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Gwen Stefani kept her look more casual than usual on the 2012 American Music Awards red carpet. Her dressed-down look consisted of leather trousers and an elaborate, oversized Balmain jacket that revealed her sexy black bra. The "No Doubt" singer finished the look with Neil Lane diamond earrings, walking the carpet alongside her equally well-dressed bandmates.

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Ludacris kept it casual in a white T-shirt, baggy jeans and a leather jacket on the 2012 AMAs red carpet in Los Angeles.

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Gloria Estefan was reflective in a fitted, floor-length pale green gown at the 40th Anniversary American Music Awards.

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Kelly Rowland glowed on the 2012 AMAs red carpet in a patterned white dress and strappy sandals.

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Karmin couple Amy Heidemann and Nick Noonan matched in shades of dark blue on the 2012 American Music Awards red carpet.

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50 Cent looked sharp in a crisp gray suit and checkered button-down on the AMAs red carpet.

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Carrie Underwood, who debuted her new "Two Black Cadillacs" single at the 2012 AMAs, looked pretty in purple as she stepped out on the red carpet in a beaded, violet and fuchsia floor-length gown by Abed Mahfouz.

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Lady Antebellum's Charles Kelley, Hillary Scott and Dave Haywood looked dapper in black on the 2012 AMAs red carpet.

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Backstreet's back (alright!). Backstreet Boys A.J. McLean, Howie Dorough, Brian Littrell, Nick Carter and Kevin Richardson pose on the AMAs red carpet.

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P!nk ruled the red carpet in a Catherine Deane maxi dress with a bronze laser-cut leather top and a billowing chiffon skirt.

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Colbie Caillat went backless in a draped, low-cut gray gown on the 2012 AMAs red carpet.

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Gavin DeGraw looked dapper in a black suit and classic fedora on the American Music Awards red carpet.

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Tyga made a serious statement on the 2012 AMAs red carpet in an all-red suit and studded leopard loafers.

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Christina Aguilera sashayed down the red carpet in a billowing, purple ombre Pamella Roland gown, which she switched out during her performance for a black, star-covered corset by The Blonds. The "Voice" judge also revealed her new, edgy blonde bob at the show.

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Tom Parker, Max George, Siva Kaneswaran, Jay McGuiness, and Nathan Sykes of The Wanted look sharp in an array of dark suits at the 2012 AMAs.

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Model Mayra Veronica showed some skin in a drop-waist red gown at the AMAs in Los Angeles.

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