Photo: Phil Loftus/Capital Pictures/Everett Collection/Rex USA/Orion Pictures Corporation/Retna Ltd.
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Birthday: Aug. 17, 1960
Sean Penn got his break as the goofy but lovable stoner in "Fast Times at Ridgemont High." From there he went on to star in huge movies, like "Dead Man Walking" and "Mystic River." In the midst of making a ton of films, he married and divorced Madonna, then later settled down with Robin Wright, with whom he shares two children (Sean and Robin are now divorced). Sean now focuses much of his time on humanitarian efforts, mainly in Haiti, and advocates for same-sex marriage. What a guy!