Actor Charlie Sheen pulled a Britney and completely shaved his head after his alleged affair with escort Angelina Tracy (more details/photos here) made headlines this week. An insider tells the “Two and a Half Men” star shaved his hair to avoid drug tests.

Charlie voluntarily checked into rehab after being charged for domestic violence in result of the infamous Christmas’ Day incident with his wife, Brooke Mueller. Charlie and Brooke were apparently both drunk that day but the actor is in danger since one of the conditions of his bail states he can’t use drugs or consume alcohol.

The 44 year-old actor’s erratic behavior and extreme makeover are worrying people closer to him. “His behavior has been so erratic that his friends and family are concerned. He isn’t keeping in contact with anyone that he used to right now,” a family friend told InTouch.

More On Charlie Sheen & Brooke Mueller Domestic Violence Case
Charlie Sheen Arrested For Assaulting Brooke Mueller (Mugshot, PHOTOS)
Brooke Mueller Was Totally Drunk Now Wants Divorce
Brooke Mueller Has Restraining Order Against Charlie Sheen
Charlie Sheen Pulled Knife On Wife Brooke Mueller
Charlie Sheen’s Wife Brooke Mueller 911 Call (AUDIO)
Brooke Mueller & Charlie Sheen Domestic Violence: Police Report Nasty Details
Brooke Mueller Drug & Alcohol Abuse Secret Past (Mug Shot)
Denise Richards To Spill The Beans About Charlie Sheen
Charlie Sheen Visits Wife Brooke Mueller In Hospital (PHOTO, VIDEO)
Brooke Mueller Checks Into Rehab For Substance Abuse
Charlie Sheen Charged With Felony On Domestic Violence Incident
Brooke Mueller Sues Rehab Center For Leaked Substance Abuse Info
Charlie Sheen Leaves “Two and a Half Men” To Enter Rehab
Denise Richards To Testify Charlie Sheen Threatened To Kill Her Too
Brooke Mueller & Charlie Sheen Multiple Sex Partners, Threesomes & Drugs!
Angelina Tracy PHOTOS: Charlie Sheen Cheating On Brooke Mueller With Lingerie Model

[image courtesy of InTouch]