Justin Bieber disses Prince William in new interview, asks why he didn't prevent his thinning hair

Justin Bieber has dissed Prince Williams thinning hair in a recent interview with U.K.'s Rollercoaster magazine.

The Boyfriend singer, 18, whos known for his abundance of hair, wondered why the royal doesnt do anything for the hair thats thinning.

"I mean, there are things to prevent that nowadays, like Propecia," Bieber told the magazine, Us Weekly reports. "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?"

However, Bieber is now facing backlash from his comments.

British journalist and author, Jessica Callan, told The Huffington Post how they feel about Biebers advice across the pond.

The Brits are viewing Justin Bieber's diss about Prince William's challenging hair problem in the same way you view an annoying fly buzzing around you. He needs to be swatted away," she said.

Callan continued, Wills and Prince Harry may joke about William's thinning hair, but that doesn't mean a kid like Justin can come sauntering in and join in the joke. It's like inviting someone over for dinner and they tell you how awful your carpet is. Even if you agree, how dare they say it?