Troubled Britney Spears has been involved in another fender-bender - with another instant online video, it has been reported.

Paparazzi had cameras rolling when the pop star's white Mercedes-Benz coupe rear-ended a red Ford Explorer on Tuesday in Beverly Hills.

The video, posted on TMZ.com, shows ponytailed Spears in the driver's seat. Wearing aviator sunglasses, she covers her mouth with her hand after realising she hit the car in front of her.