A famous actor was secretly in rehab for substance abuse. The actor is said to have been battling substance abuse since hurting himself on the set of his new movie back in December. His problems were first with prescription medication but eventually evolved to cocaine usage and heavy drinking. He has was in the Betty Ford Center for three weeks now was just released this afternoon. Find out who it is after the jump.

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Gerard Butler is being treated for substance abuse at the Betty Ford Center … TMZ has learned.

Butler’s problems were triggered by the physical demands of shooting “300” in 2006. We’re told the actor began struggling with pain management, and the problem became exacerbated while filming “Of Men and Mavericks,” when Butler was badly hurt on December 18 during a surfing accident.

We’re told Butler realized he was relying too much on prescription drugs and decided to head off a full-blown addiction by entering Betty Ford three weeks ago.

Sources tell TMZ … Butler also developed issues with cocaine, but the root problem appears to be the injuries and pain management.

We’re told Butler will be leaving Betty Ford later today.

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