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Conrad Hilton, left, son of Kathy and Rick

Conrad Hilton, left, son of Kathy and Rick Hilton, and brother to socialite Paris Hilton, was ordered to undergo a residential substance abuse treatment program for at least 90 days. A judge in Los Angeles made the order Tuesday, Jan. 26, 2016, after Hilton, 21, failed drug tests and violated probation that was handed down in 2015, after he pleaded guilty to disrupting a British Airways flight. (Credit: AP / Matt Sayles)

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Celebrities who have been to rehab

With reasons ranging from "personal health" to hard drugs, these celebrities have all spent time in rehabilitation centers.

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