Robert Downey Jr.

Robert Downey, Jr. almost defines the celebrity rehab revolving door -- he was introduced to drugs when he was only 8 years old (reportedly by his father, among others -- yay, parenting!), and entered rehab for the first time in 1987 when he was 22 years old. In 1996, he was arrested multiple... Kevork Djansezian, Getty Images
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