Since Justin Bieber is the biggest pop star in the world, you would think there’s a sure chance he’ll be around for quite some time, right? Sharon Osbourne doesn’t seem to think so!

During the National Radio Conference in Sydney, Australia, Sharon said Justin “is a really great little guy. But that’s his problem – he’s a little guy.” Can you go into a little more detail about that, Sharon? “His fans are growing up, they’re 18, 19-year-olds now… they’re young women. And he still looks like that little boy.”

Related Article: Justin Bieber Stolen Footage RELEASED!

She didn’t just criticize young-looking Justin. She offered up some advice for the pop star as well! “He needs some hair, or something… I just don’t think, from my gut – maybe my gut’s wrong, because it’s not 100 percent – but I don’t think he’s going to stand the test of time,” she said. “But you know what, I don’t feel sorry for him, because he’s made oodles and he’s a fabulously nice person and he’ll go on to do something else.” Cue the Beliebers backlash!

Could these all be fighting words?! Justin took to Twitter, of course, to address the comments, writing, “doubt me….i like it.” He then directly tweeted Sharon, writing, “Not worried Sharon,” along with a link to his new Beauty and A Beat music video.

Who’s side are you on? Team Sharon or Team Justin? Does Justin have what it takes to stand the test of time? Share your thoughts in the comments section below!

Photos Courtesy of Fame FlyNet