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1. Celebrating tonight.
Odds are that Gomez's 21st won't be as wild and crazy as, say, Prince Harry's infamous romp in Vegas, but you never know. The brunette beauty does have a big night planned. As far back as April, she was talking about having a huge hip-hop-themed bash at her house to mark the occasion. Then, just last month, she shared a few more details. "My family from Texas, my friends [and] my cousins are flying in," the Dallas-area native told "Entertainment Tonight." "I will have some of my best friends in L.A." Just make sure to have guests drop off their cell phones at the door, Selena!

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Selena Gomez's Bad-Girl Moments

July 18, 2013

Selena Gomez is a good girl, but the former Disney diva has had her bad-girl moments. In honor of her 21st birthday — a time when all of us have been known to cut loose — on July 22, take a look back at the rare instances when Selena showed her naughty side.