Happy Birthday Mr. President!

President Barack Obama turns 50-years-old today, but he started the celebrations last night at a fundraiser in Chicago -- where Jennifer Hudson, OK Go and Herbie Hancock all performed.

As for his plans today, he'll be returning to Washington to have a party with friends and family, including daughter Malia, who's returning home from camp for the occasion.

George Clooney, Susan Boyle, Heather Locklear and even little Cindy Brady -- check out the gallery above to see which big stars also turned (or will turn) 50 this year!

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