Los Angeles - Britney Spears has left rehab.

Singer Britney Spears poses backstage following the Baby Phat 2007 Fall collection during New York Fashion Week February 2, 2007 file photo. [Reuters]

The pop star checked out of Promises Malibu Alcohol and Drug Rehab Treatment Facility "after successfully completing their program," the pop star's manager, Larry Rudolph, said in a statement released by Jive Records late Tuesday. "We ask that the media respects her privacy as well as those of her family and friends at this time."

Spears, 25, entered the facility Feb. 22, after a bout of bizarre behavior that included shaving her head, getting tiny lips tattooed on her wrist and beating a car with an umbrella, with photos of the incidents instantly beamed worldwide.

Spears' activities have been weekly magazine fodder since she filed for divorce from aspiring rapper Kevin Federline in November. The two have joint custody of their sons, Jayden James, 6 months, and Sean Preston, 18 months. Federline and the children reportedly visited Spears during her treatment.

Federline, an aspiring rapper who released his debut album in November, will celebrate his 29th birthday Wednesday with a party at West Hollywood nightclub Eleven. A second bash will be held at Pure Nightclub in Las Vegas on Saturday, said Federline's publicist, Marilyn Lopez.

Spears has not disclosed why she sought treatment at Promises, which offers detox, counseling and 12-step programs. A 30-day stay at the plush, oceanfront facility costs $48,000.