The Baby hitmaker's bad boy antics have dominated the headlines in recent weeks and he was back in the news again on Monday (29Jul13) when Canadian border patrol police found marijuana and drug paraphernalia on his tour bus.
Bieber has also been accused of spitting from a hotel room balcony, feuding with his California neighbours, and urinating in a mop bucket in a New York City restaurant.
Rock matriarch Osbourne has now waded into the debate over Bieber's highly-publicised troubles, and she is convinced the 19 year old is trying too hard to reinvent himself as a tough guy.
She tells Thedailybeast.com, "I feel really bad for him. There's this little kid with a huge dream, he's cute, girls love him, and he wants to be a mean boy, and he's about as mean as a f**kin' kitten, and he's trying to act out. It's like p**sing in a bucket. It's like, 'Oh, we're the bad boys!' F**k off! You don't know what bad is."
Osbourne concludes the star could easily fall from grace and lose the career he has worked so hard to build.
She adds, "I think that he's lost, I really do. I think he doesn't realise he's white and not black, that's a huge problem. And, at the point he's at in his career, it's so dangerous because we've seen it all before a million times. Where do you go when you're a child entertainer and then you want to transition to be a man? Very few make it."
Osbourne's outburst comes as a representative for Bieber addressed allegations he was caught on camera spitting off his hotel balcony in Toronto, Canada earlier this month (Jul13), insisting the star was not deliberately aiming at a group of fans below. The spokesman tells Usmagazine.com, "Justin didn't spit on anyone. No fans were below the balcony."