Charlie Sheen's father Martin and mother Janet Templeton have reportedly expressed their worry over the actor's current state.

The star was rushed to Cedars-Sinai Medical Centre in Los Angeles earlier today, where he is still in an unknown condition after suffering "severe abdominal pains".

Sheen's parents "are very concerned" about his progress, a source told People.

His rep Stan Rosenfield has refused to respond to TMZ's claim that Sheen's hospitalisation is the cause of a 36-hour bender which included drug-taking from a "briefcase full of cocaine".

Rosenfield told the website: "I can't comment because I have no idea if it's true. You choose to believe your source. I don't."

CBS entertainment president Nina Tassler confessed earlier this month that the network has a "high level of concern" about the Two and a Half Men actor's well-being.