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Hollywood's Biggest Players!

With John Mayer celebrating his 34th birthday on Oct. 16, we look at the celeb guys who just can't seem to settle down (17 Photos)

Donna Kaufman on Oct 13, 2011 at 4:41PM

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Leonardo DiCaprio

He's not only the "king of world," he's the king of on-again, off-again relationships! The 36-year-old actor tends to have more break-ups in a single relationship than most people have in their whole life, especially with his last two girlfriends: supermodels Gisele Bundchen (2001-2005) and Bar Refaeli (2005-2011). Before, after and sometimes during those relationships, Leo has dated Blake Lively, Kate Moss, Carmen Electra, Liv Tyler, Alicia Silverstone and Claire Danes. Even so, he tells Access Hollywood that he will "absolutely" settle down and get married one day – "and I look forward to it."