Britney Spears was arrested in Ventura County, California Wednesday night for a DUI, law enforcement sources tell TMZ.

The pop superstar was handcuffed by the California Highway Patrol around 9:30 PM last night, and she was booked by the sheriff’s department around 3 AM. She was released from jail around 6 AM today, according to inmate records.

Britney was by herself when cops pulled her over in Westlake Village … not far from her home. She was taken to a hospital immediately after she was pulled over, TMZ has learned.

CHP officers transported her there to draw her blood … according to multiple sources close to Brit. She did not sustain any injuries, and the hospital visit was purely to determine her blood alcohol content.

TMZ has reached out to her team for comment.

Brit’s run-in with the law comes just after she scored a legal victory when she was granted a permanent restraining order against a Louisiana man who randomly showed up at her L.A.-area home after allegedly sharing several “disturbing social media posts.”

The “Toxic” singer herself has run into legal troubles before … in 2007, she faced misdemeanor charges and a possible jail sentence for an alleged hit-and-run with a parked car in Los Angeles. The fender-bender charges were eventually dropped because she paid the owner of the vehicle for damages, and a mistrial was declared after the jury deadlocked in her trial for a driving-without-a-California-license.

Shortly after her hit-and-run, Britney lost custody of her 2 boys with Kevin Federline following some concerning public incidents and her alleged abuse of substances and alcohol.