Selena Gomez celebrates 20 at Teen Choice Awards 2012

Singer Selena Gomez blows out the candles on a birthday cake onstage during the 2012 Teen Choice Awards at Gibson Amphitheatre on July 22, 2012, in Universal City, Calif. Pictures: The Red Carpet Kevin Winter/Getty Images

Selena Gomez gives out birthday cupcakes to the audience during the 2012 Teen Choice Awards at Gibson Amphitheatre on July 22, 2012, in Universal City, Calif.
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(CBS News) Selena Gomez turned a sweet 20 years old at the Teen Choice Awards Sunday night.

When the singer-actress hit the stage to accept the choice music group award for her band, Selena Gomez and the Scene, she was serenaded at Los Angeles's Gibson Amphitheatre with an audience rendition of "Happy Birthday."

Pictures: The red carpet
Pictures: Show highlights
Pictures: Stars in the press room
Read more: List of winnners
Read more: Teen Choice Awards 2012

Gomez also received cupcakes topped with glowing sparklers for her to blow out.

"This is the best birthday present ever," Gomez said.

The Texas native sat in the front row next to her beau, Justin Bieber, who also picked up a couple of awards Sunday night, including choice male artist and choice male summer star.

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