Justin Bieber makes "disposable music" that doesn't give him "a licence to misbehave", according to Sharon Osbourne.
The former X Factor judge and music manager is the latest celebrity to weigh in following Justin's recent run-ins with the law.
Speaking on Chelsea Handler's US talk show, Sharon said if she was the teenager's manager "he would have to go to a hospital to get my foot out of his a**".
"And after they pried my foot from his a**, it's all about the music," she added.
Sharon went on: "If you make great music, I'll accept anything. If you're a great artist, I'm not so judgmental. But when you do floppy, poppy, disposable music, I don't care."
The Talk star, who has had success managing artists including her hubby Ozzy Osbourne, also said she isn't sure Justin, 19, does anything that will "stand the test of time".
"If I seriously managed him, I would put him in the studio until he came out with a great album. And then, it gives you a licence to misbehave," she said.
Meanwhile, Justin's recent troubles don't seem to have hurt his popularity after it was reported that his Madame Tussauds waxwork in New York has been groped so many times that it is starting to wear away - and has had to be removed.
A source told The New York Post's Page Six: "With no ropes or barriers to stop them, thousands of fans have had their photographs taken with him since then - but it has taken its toll."
Madame Tussauds' general manager Bret Pidgeon said they are looking forward to welcoming "a new 'grown-up' Justin" model back to the attraction in the future.