Since news broke that Zac Efron went to rehab five months ago, there's been plenty of speculation about why he went in the first place.
Based on the initial report that he is "happy and not drinking," most assumed he was in treatment for alcohol addiction.
According to a new report, Zac allegedly went to rehab to battle a cocaine addiction.
TMZ reports that, according to multiple sources, Zac's addiction got out of control while filming the movie Neighbors with Seth Rogen.
The insiders tell TMZ that the actor didn't show up for work some days, with one source saying, "It was common knowledge he was struggling with cocaine."
According the TMZ, three sources say that he also took Ecstasy and that earlier this year, Zac and friends "went on a coke rager in a room at the SkyLofts at the MGM Grand in Vegas," the site reports.
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