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Kate Upton, Sports Illustrated 2014

James Macari/Sports Illustrated

Happy Birthday, Kate Upton!

The ultimate blond bombshell turns 22 today, and the beauty has already received lots of birthday wishes on Twitter. Her sis Christie Upton even posted a sweet photo on Twitter, writing, "Happy Bday to my beautiful sister @KateUpton – I wish we could celebrate but good thing you have a whole BDAY MONTH!!"

And there's really no better way to celebrate the stunner's special day than with some of her hottest pics ever. From her gravity-defying cleavage to her topless covers, the supermodel loves flaunting her incredible curves, and we're certainly not complaining!