AceShowbiz - Outspoken comedienne Joan Rivers has blasted troubled star Charlie Sheen for his recent "outrageous" behavior, insisting he should clean up his act for the sake of his children. Sheen began a rehabilitation program last week shortly after he was hospitalized to treat a hernia, causing production on his hit TV show "Two and a Half Men" to be put on hold while he gets clean.

And Rivers admits she is disgusted Sheen can continue his wild ways when he has four children - slamming the star for not giving up booze and drugs when he became a father. She tells The Advocate, "I think he's an a**. When you have a child, darling, you'd better start setting an example."

"Childhood for you is over when you have a child. I find it outrageous to be carrying on like that. I also think that when you get the gold ring you have an obligation. The old studio system made you have an obligation to live a clean life and be the example. What am I going to tell my grandson who watches Two and Half Men? I just think he's awful."