James Macari/Sports IllustratedHappy 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!