The Watchmen and American Horror Story vet made the revelation in an emotional Memorial Day Weekend Instagram post. "I’ve been DREADING this day for 17 years," he wrote. "The day when my horrible secret would be revealed," he began his lengthy post on Instagram. "No, this gnarly scar across my head isn’t from life-saving brain surgery, nor did I narrowly survive a shark attack. It’s worse. (At least in Hollywood...) I had hair transplant surgery. 5 of them, to be exact over 14 years."