Troubled pop star Britney Spears has gone into rehab.

Entertainment website TMZ.com says that Britney has checked into the Promises treatment centre in Malibu.

The singer is said to have spent just 24 hours in a facility last week before shocking fans and prompting fears over her health by shaving off her own hair in full view of photographers.

Her manager Larry Rudolph told People magazine on Wednesday: “Britney Spears has voluntarily checked herself into an undisclosed rehab facility.

“We ask that the media respect her privacy as well as those of her family and friends at this time.”

The 25-year-old mother-of-two reportedly visited Eric Clapton’s Crossroads Centre in Antigua for just one day last week.

Her wild weekend began on Friday night when she turned up at Esther’s Hair Salon in Tarzana, California, and demanded that owner Esther Tognozzi shave her head. When the hairdresser refused, Britney grabbed the clippers and did the job herself, as shocked passers by and photographers watched through the windows.

The star then moved on and got two new tattoos of pairs of pink lips, while listening to a Janis Joplin CD.

Ms Tognozzi said that after Spears had finished with the razor, she gazed into the mirror with tears in her eyes and said: “Oh, my God, I shaved it all off. My mom is going to be so upset with me.”

By Sunday however she was up and about and sporting a cheap-looking platinum blonde bobbed wig. The Toxic singer had an early dinner with her father before hitting a West Hollywood nightclub.