Los Angeles police Lt. Mario Munoz said officers observed several cars following a white Mercedes-Benz around 11:30 p.m. Wednesday in Mission Hills.
The cars were following Spears' car too closely and traveling at unsafe speed. They also made several unsafe lane changes, authorities said.
Munoz said officers stopped the Mercedes, interviewed Spears and released the 26-year-old pop star after verifying her driver's license.
But the four photographers in the cars chasing her were booked for investigation of reckless driving.