JUSTIN BIEBER MAKES FUN OF PRINCE WILLIAM'S THINNING HAIR

Asked about the 30-year-old future King's tresses during a magazine interview, he responded: "I mean, there are things to prevent that nowadays, like Propecia.

"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?"

Prince William's army of fans are likely to be angry with the comments.