TORONTO - An assault charge against pop star Justin Bieber has been withdrawn in connection with an incident involving a Toronto limousine driver.

The Crown says the charges were withdrawn because there was no reasonable prospect of conviction.

The charge stemmed from an early morning incident on Dec. 30, when Bieber and five other people were picked up by a limousine from a Toronto nightclub.

Bieber was charged with one count of assault after police alleged one of the passengers hit the limousine driver during an altercation.

It is one of a series of legal troubles faced by the 20-year-old singer.

Bieber was arrested in Florida in January after what police alleged was an illegal street race involving the pop star and his friend.

In August, Bieber pleaded guilty to charges of careless driving and resisting arrest in that case and in a plea bargain was sentenced to an anger management course, a $500 fine and a $50,000 charitable contribution.

On Aug. 29, Bieber was arrested and charged with dangerous driving and assault following a collision between a minivan and an ATV in a rural area northeast of Bieber's hometown of Stratford, Ont.

The driver of the ATV and an occupant of the minivan "engaged in a physical altercation," according to police.

Bieber is to appear in court on those charges on Sept. 29.