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3. Demi Lovato
The singer and actress went to a rehab institute at the age of 18 after hitting one of her backdrop dancer on a private jet, missing out her tour with the Jonas Brothers because of the incident. She had bipolar disorder accompanied by bulimia and a crush for cocaine, later admitting that she was under its influence when talking about her sanity in a 2012 documentary, Demi Lovato: Stay Strong. However, she managed to get off drugs that year, but still talks about her mental illness.
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