'Vampire Diaries' Nina Dobrev celebrates her birthday in Vegas. Have some cake.

"Vampire Diaries" star Nina Dobrev turned that magical age of 21 on Jan. 9, but she waited until this past Saturday (Jan. 16) to really have an all-out celebration at Studio 54 in Las Vegas.

Other celebs in attendance included "Vampire" castmates Candice Accola, Sara Canning, Matt Davis, Kayla Ewell, Katerina Graham, Steven R. McQueen, Zach Roerig, Ian Somerhalder and Paul Wesley, "90210's" Matt Lanter and former "TBL: The Beautiful Life" stars Benjamin Hollingsworth, Sara Paxton and Nico Tortorella.

Reportedly Davis, Somerhalder and Wesley only stayed at the party for 20 minutes before hitting the MGM Grand hotel's blackjack tables. It's all about priorities.

Nina was surprised with a three-tier birthday cake. Canning suggested she wish for a boyfriend, at which point Nina immediately blew out the candles.

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Photo credits: RD/Erik Kabik/Retna