青少年流行音乐歌星在加拿大和美国反驳指控

Teen pop singer Justin Bieber was charged Wednesday with assault for allegedly hitting a limousine driver in Toronto, adding to a string of legal troubles for the young star.

The 19-year-old Canada native turned himself in at a Toronto police station Wednesday as crowds of photographers and fans surged around him and his security team despite frigid temperatures.

Bieber's attorney later told reporters his client will plead innocent when he appears in a Toronto courtroom March 10.

The charges stem from an incident December 30, in which a limousine driver picked up Bieber and five other people at a Toronto nightclub. The driver later got out of the vehicle and called police after allegedly being hit in the head several times.

Also Wednesday, Bieber pleaded not guilty to charges in the U.S. state of Florida of driving under the influence ((of alcohol and prescription drugs)), resisting arrest, and driving with an expired license. Bieber was arrested earlier this month after police caught him drag racing on a residential street in Miami, Florida.

Police said he cursed at officers at the time of his arrest, and that he later admitted to drinking alcohol, smoking marijuana and taking prescription drugs.