EXCLUSIVE: Within hours of being hospitalized Thursday morning, Charlie Sheen's ex-wife Denise Richards was at his bedside once again doing everything in her power to help the troubled father of their two daughters. Sources close to the actress tell me she has joined his famous father in calling for Charlie to enter rehab.

"Denise is heartbroken and fears the day when she gets the call saying Charlie is no longer alive," a friend of the actress tells me.

This time, I'm told, is different, and Denise has decided that she is going to do whatever it takes to make Charlie realize he needs help. First things first, she believes he needs a new inner circle of friends.