Hair today, gone tomorrow. Hot on the heels of rumors that he cheated on wife Brooke Mueller with a paid escort, Charlie Sheen was obviously feeling a little toxic. That's the only explanation we can think of for the Two and a Half Men star going out and shaving his head a la Britney Spears. Or maybe, just maybe, his mustache disguise wasn't cutting it anymore, so he opted to go hairless. Sheen was spotted out and about on Wednesday sans his usual messy mop. It's easy to draw parallels between Sheen and Spears, who shaved her head after bolting from rehab. Back then it was assumed Spears shaved her head to avoid being drug tested. No word on whether that could also be the case for Sheen, currently being treated for cocaine and alcohol addiction. As for the 'stache, Sheen's mouthpiece maintains it's all in good fun. Publicist Stan Rosenfield says that Sheen was simply making a house call on behalf of a fellow addict, "The woman in question is the sister of one of Sheen's campmates, and Sheen was only responding to a 12th-step call. Since Sheen knew he was being followed and how this would look, he wore the mustache in a tongue-in-cheek disguise gesture." Sure... When we think of people who can lend a helping hand in addiction assistance, Sheen isn't exactly the go-to guy. Unless by helping hand, they mean showing her how to snort a line...or better yet, paying her for sex.