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"Jersey Shore" alum Mike "The Situation" Sorrentino says he realized he was addicted to drugs when he ran out of a prescription medication he was taking to treat an injury he'd sustained years earlier on "Dancing With the Stars."

The hard-partying, self-proclaimed guido rose to fame on MTV's juggernaut reality series. Sorrentino and his costars drank heavily, slept around and reveled in the summer offerings of Seaside Heights, N.J.

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Sitch later went on to appear on...