Justin Bieber makes fun of Prince William’s thinning hair

                       Follically-gifted Bieber.                                                                             Heir to no hair, William.Justin Bieber's mop top has been the butt of many jokes over the years, and he can not only take it — but he can apparently dish it out, too. In an interview with Rollercoaster magazine, the "Boyfriend" singer called out none other than his royal highness, Prince William, for his thinning hair. "I mean, there are things to prevent that nowadays, like Propecia," Bieber, 18, told the U.K. publication. "I don't know why he doesn't just get those things, those products. You just take Propecia and your hair grows back. Have you not got it over here?"