Britney Spears has been filmed driving erratically after a night out with pals, amid claims she's "spiraling" over Kevin Federline's bombshell memoir.

RadarOnline.com can reveal the singer was filmed leaving the Thousand Oaks restaurant Red-O in Los Angeles and getting into the driver's seat of her black BMW after several people allegedly attempted to stop her. Article continues below advertisement

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An onlooker claimed the pop star "nearly ran over her friend while pulling out" of the parking lot.

In the video, Spears, 43, was seen swerving into opposite lanes, including a bike lane, as she made her way to her Thousand Oaks estate.

At one point, she tailgated

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