It's also being reported that Bieber was racing against rapper Khalil (also arrested) who seems to have been driving a Ferrari 16M Scuderia Spider (although it was mistakenly called a "red Lambo" in the article). There is no additional information about the arrest of either men, but TMZ has obtained eyewitness video, which is posted below, that shows Bieber in his Lamborghini surrounded by fans and then later shows the car stopped by police officers.
UPDATE: As it turns out, the cars in question didn't actually belong to either Bieber or Khalil. We just received an email that indicates that both the Ferrari and the Lamborghini involved in the incident were rentals. The president of Lou La Vie, an exotic car rental outfit in Miami, is claiming ownership of both vehicles, though didn't provide any other significant information regarding the case.