Charlie Sheen has announced he is taking a leave of absence from CBS's Two and a Half Men to enter rehab, says the actor's publicist. This follows his December arrest for domestic abuse against wife Brooke Mueller, who is also in rehab. According to a blurb on The Hollywood Reporter's website, publicist Stan Rosenfield released the following statement: "As a preventative measure, Charlie Sheen has entered a rehabilitation facility. He will take some time off his series 'Two and a Half Men.' He has asked that his privacy be honored. No further statements are planned." UPDATE: CBS has halted production on Two and a Half Men. Developing...