It's hard to believe that Kate Upton was virtually unknown three years ago, considering she's everywhere these days. The Michigan-born beauty, who blew up the Internet doing the Dougie at a Clippers game, has become one of the world's most in-demand models. Since 2011, she's covered every publication from Sports Illustrated to Vogue and debuted her first starring film role, in The Other Woman.

And get this: that all happened before her 22nd birthday, which she's celebrating today. In honor of her special day, here are 20 things you didn't know about Kate Upton.

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