Britney Spears hit a car while driving south on the 101 Freeway today around 8:30 pm PT.

Britney was driving her white Mercedes SL convertible, with her bodyguard in the passenger seat. She was driving at an average speed, according to our photographers, but didn't stop quickly enough when the car ahead of her broke for traffic.

In the other car was a male driver, no passengers. Immediately after the accident, he stopped his car in the center lane and the fire department and police responded, blocking all south-bound lanes of the freeway temporarily. Traffic on both sides of the 101 was at a stand-still.

Spears was taken to a nearby fire station for an alcohol test; she was not found to be intoxicated, according to sources.

Brit was released and is back at her Beverly Hills home now.

More details to come, plus photos and video ...