CHARLIE SHEEN donated $75,000 to help a 10-year-old girl who's fighting cancer, and his stunt double Eddie Braun chipped in $25,000 . . . for a grand total of $100,000. It all came about because Charlie was talking to a Hermosa Beach Police officer, and in the course of the conversation, the cop mentioned that a fellow cop had a daughter with cancer. The next day, he and Eddie sent the money to the Hermosa Beach Police Officer's Association.  All the proceeds will go to the family.  ((E! Online)