Gerard Butler in Rehab

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 3 weeks ago.