A. J. McLean, popular 90's Backstreet Boy, shocked the world when he got a hair transplant. Before and after photos show that the former teenage heartthrob was drastically balding in his early 30's. He had common male pattern baldness where the hairline recedes up the temporal peaks and in the front. It was also aggressively thinning on the top of his scalp. Now he has a nice straight hairline from side to side.