Justin Bieber's new fling wants him to stop his bad behaviour.

The 19-year-old star - whose recent controversy includes being investigated over the egging of a neighbor's house and getting arrested for driving under the influence (DUI), resisting arrest and driving with an invalid licence - is said to be dating Katherine Gazda, who wants him to settle down.

A source told the Sunday Mirror newspaper: ''They hit it off straight away and are both really serious about one another.

''But their relationship has been very up and down because she can't stand the way he has been behaving recently. She is desperately trying to help him through all the scandal and regain his clean-cut image.

''Underneath all the bravado and controversy, Katherine believes he's a lovely kid with a real heard, she just thinks he is being led astray.''

Despite the influence of Katherine - who was introduced to him at the end of last year - it appears the 'Beauty and a Beat' hitmaker is in for more drama.

According to the Sunday People newspaper, Justin's lawyers are trying to stop half-naked pictures of him in a US police station from being given to the media.

The images were apparently taken after his arrest for drag racing, and a motion has been filed to a Florida judge.

It reads: ''While in custody the defendant was captured on videotape in various states of undress which show intimate personal parts of the defendants body.''

Justin has pleaded not guilty to drag-racing, DUI and driving without a valid license, and he faces trial on March 3.