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Lauren Conrad, the former star of The Hills and the person to blame for introducing Heidi Montag to the world, turns 24 today. Michael C. Hall, the star of Showtime's Dexter, is turning 39. Outkast's Big Boi is 35. Lisa Marie Presley, the singer and spawn of Elvis, is turning 42. Princess Stéphanie of Monaco is 45. Pat Wilson of Weezer is turning 41. Poker champion Phil Ivey is 34. And Mr. Pauly Shore celebrates his 42nd birthday today.