Justin Bieber recently joked about Prince William's noticeably thinning head of hair to UK's Rollercoaster magazine, telling the Duke of Cambridge he should get pills for his failing follicles.
"I mean, there are things to prevent that nowadays, like Propecia," the 18-year-old pop star told the magazine. "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?"
Easy for the luxuriantly-coiffed Bieber to say.