Reality Tv star Judge Judy has branded Justin Bieber a "fool" for risking his career with his bad boy behaviour and run-ins with the law.

The Baby hitmaker has been mired in numerous legal troubles in recent months, and the television judge, real name Judith Sheindlin, has now warned the pop star he is abusing his celebrity status.

She tells CBS Los Angeles, "Being a celebrity is a gift. You could either treat it reverently or you could make a fool out of yourself. And he's doing a very good job of making a fool out of himself... I think it's sad. And nobody's going to remember that he was a marginal singer. But they're going to remember a young kid who had a chance to have it all and who is blowing it by acting like a fool."

Bieber was arrested in Florida in January (14) on suspicion of driving under the influence, while he is also facing an assault charge in Canada over an alleged attack on a chauffeur. Police also raided the singer's California mansion last month (Jan14) over allegations the singer pelted a neighbour's home with eggs.