The month of October was a big marketing month for Audi, and the company didn't have to lift a finger. The celebs, including Chris Brown, were out in full force, showing off their shiny black R8s, A8s, and A5s. A new Spyder wasn't the only car Brown was seen in, though. He also added a new Lambo Aventador to his growing collection. Check that out in The 15 Coolest Celebrity Rides of October 2012.