Report: Zac Efron Was In Rehab For Cocaine Addiction, Not Alcohol Abuse

Zac Efron really managed to keep this one off the radar!

Efron completed a stint in rehab five months ago, according to E! News, and while a source tells the site that the 25-year-old actor is "healthy, happy and not drinking," TMZ reports that he was actually seeking treatment for "a serious cocaine addiction"!

The hunky star's alleged drug use got "out of control" during the filming of the upcoming comedy Neighbors, which was shot in May when the above photo (and these!) were taken. Apparently Zac "was a no-show on a number of days," and a source tells the site, "It was common knowledge he was struggling with cocaine." The website also reports that earlier this Zac "went on a coke rager" in a room at the SkyLofts at the MGM Grand in Vegas and caused nearly $50,000 in damage. What?! Troy Bolton would never!

When asked for a statement, Zac's publicist said, "Don't think we'll be making a comment."