After nearly a month of seclusion in a luxurious rehabilitation center, Britney Spears has moved ... Britney Spears Leaves Reha

The pop star checked out of Promises Malibu Alcohol and Drug Rehab Treatment Facility "after successfully completing their program," Spears' manager, Larry Rudolph, said in a statement released by Jive Records late Tuesday.

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. Photos of the incidents were instantly beamed worldwide.

Spears' activities have been fodder for weekly magazines and entertainment Web sites since she filed for divorce from aspiring rapper Kevin Federline in November, citing irreconcilable differences.

Under a temporary agreement, 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, who released his debut album in November, is celebrating his 29th birthday this week. Two bashes have been planned - one on Wednesday at West Hollywood nightclub Eleven and another on Saturday at Pure Nightclub in Las Vegas, said Federline's publicist Marilyn Lopez.

It was unclear if Spears' discharge would change Federline's party plans, and a message left with Lopez early Wednesday for comment wasn't returned.

Spears has not disclosed why she sought treatment at Promises, which offers detox, counseling and 12-step programs. A 30-day stay at the Mediterranean-style villa tucked in the Santa Monica Mountains costs $48,000.

With her stay there, Spears joined a long list of other celebrities who have trekked to the facility to overcome addictions. Promises alumni includes Ben Affleck, Charlie Sheen, Diana Ross and Matthew Perry.

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