After just two short weeks in rehab, Charlie Sheen is readying to return to work. The Two and a Half Men actor is preparing to check out of a facility so that he can resume filming on the popular CBS sitcom. We're betting the only thing that got rehabilitated in two weeks was the actor's image... if that. The shooting of Two and a Half Men came to an abrupt halt after the 44-year-old actor admitted himself to rehab for "preventative measures," which means he probably had to go if he wanted to extend his contract with CBS. Sources say Sheen had fallen off the wagon and was using both alcohol and cocaine, a major no-no for the actor who's struggled with substance abuse for years. Despite his attempt to clean up his act, Sheen still has a long road ahead of him. He's been charged with threatening to kill wife and fellow addict Brooke Mueller in a December 25 incident. If he's found guilty, he could be sentenced to up to three years in prison. Sheen's 32-year-old wife is undergoing in-house treatment for alcohol and crack cocaine.