He is alleged to be the real father of Michael Jackson's children. Another claim says he is being investigated for prescribing the singer dangerous narcotic pain medications and anesthesia. Now, Jackson's longtime dermatologist, Dr. Arnold Klein, speaks out to address the rumors. Klein, a Professor of Dermatology and Medicine at UCLA medical school, and a favorite of stars such as Elizabeth Taylor, flatly denies any involvement in over-prescribing drugs to Jackson. "I didn't give him this crap they are talking about," Klein states in a new interview with Good Morning America. "I've never prescribed Oxycontin in my life. How am...