Michael Jackson's dermatologist, Arnie Klein, who many believe is the real father of Jackson's kids, took to the airwaves Wednesday to deny the charges. "To the best of my knowledge, I'm not the father" of Prince and Paris Jackson, Klein told ABC's Diane Sawyer. Later in the day, he conceded to Larry King: "I once donated sperm," but insisted that it did not go to Jackson and said he'd be happy to take a DNA test to prove it. (Photo: WENN)