Billboard Music Awards Winners and Memorable Moments

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There was a double dose of Britney Spears at Sunday night's Billboard Music Awards in Las Vegas. The ultimate showgirl opened the evening with Rihanna and later joined tour mate Nicki Minaj for an encore performance.

Musicians weren't the only ones in the spotlight during the show. "Modern Family"'s Eric Stonestreet was debazzling as an Elvis impersonator, along with master of ceremonies Ken Jeong, star of 'The Hangover Part II.'

Perhaps the moment frozen in fans' minds is the kiss shared between young Hollywood couple Justin Bieber and Selena Gomez. The two shared a tight embrace when Justin won his first award of the evening for Digital Artist of the Year. When his name was called again, this time to accept for Top New Artist of the Year, the lovebirds locked lips while the cameras rolled. On the red carpet, Selena revealed that she plans to include her beau in the thank you section of her album booklet. Backstage, Justin called his special lady "amazing."

Additional performers included Beyonce, Ke$ha, Cee-Lo Green, The Black Eyed Peas and many more. Honored with the Icon Award, Neil Diamond was a crowd favorite, singing recognizable tunes from his vast music library and encouraging audience involvement. During "Sweet Caroline," the fans interjected with the "bum bum bum" and "so good, so good."

Below are the winners of the categories presented during the ABC broadcast. A complete list of winners is available at billboard.com.

Billboard 200 Artist of the Year- Taylor Swift

Digital Artist of the Year- Justin Bieber

Hot 100 Song of the Year- Taoi Cruz "Dynamite"

Country Song of the Year- Lady Antebellum "Need You Now"

Top Duo/Group- The Black Eyed Peas

Viral Innovator Award- Cee Lo Green Radio

Artist of the Year- Rihanna

Top New Artist of the Year- Justin Bieber

Country Artist of the Year- Taylor Swift

Female Artist of the Year- Rihanna

Dreamseeker Artist of the Year- Gentlemen Hall

Icon Award- Neil Diamond