Amid a crush of media and screaming fans, Justin Bieber turned himself in at a Toronto police station Wednesday night for an expected assault charge. A police official, speaking on condition of anonymity, said the charge has to do with an alleged assault on a limo driver. Toronto police said in late December they were looking into allegations that a member of Bieber’s entourage assaulted a limo driver who was ferrying the Canadian pop star and several others. Police said at the time it was unclear whether Bieber was involved. Earlier Wednesday, the baby-faced 19-year-old pleaded not guilty in Florida to charges of driving under the influence after driving nearly twice the speed limit on a Miami Beach street. He also pleaded not guilty to resisting arrest and driving with an expired license. (AP)