Sources tell ET that BRITNEY SPEARS returned to Promises residential treatment center on Wednesday night after checking out of the Malibu, CA, facility earlier that morning.

Also on Wednesday, a desperate Britney was photographed using an umbrella to hit a car outside the home where her ex, KEVIN FEDERLINE, is reportedly staying. The photos reveal a furious Britney, dressed in white shorts and a hooded sweatshirt, repeatedly striking an SUV with an umbrella.

After reportedly spending 45 minutes outside his residence, Britney's mom picked her up and eventually brought her to the rehab facility.

Britney first checked in to Promises on Tuesday. Her manager LARRY RUDOLPH released a statement that day, saying, "Britney Spears has voluntarily checked herself into an undisclosed rehab facility today. We ask that the media respect her privacy as well as those of her family and friends at this time."

Meanwhile, Federline was scheduled to go to court Thursday for an emergency hearing in Los Angeles. But ET has confirmed that the hearing has been cancelled.

Labels: Britney Spears