20 Celebrities Who Have Battled Addiction In Rehab

5. Zac Efron

Actor Zac Efron attends the premiere of the feature film
Dan Steinberg/AP

The High School Musical heartthrob spent time in rehab for cocaine abuse. Things got so bad that Efron wouldn't turn up to the set of the film Neighbors but he eventually realised his need for outside help.

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Student of film. Former professional wrestler. Supporter of Newcastle United. Don't cry for me, I'm already dead...