Britney Spears was found "vomiting uncontrollably" in the men's bathroom of a bar on Sunday night.

The singer had been drinking at the exclusive Sky Bar at Los Angeles' Mondrian hotel and needed to be carried out when she was discovered slumped over a toilet covered in vomit.

A source told Britain's The Sun newspaper: "Britney was found slumped over the toilet bowl with make-up smeared over her face and her wig hanging off.

"She had a room booked at the hotel but was too ill to stay and was begging her bodyguard to take her home. She looked a real mess and was sitting on the floor with her head over the bowl throwing up.

"There was vomit down the front of her dress and around her mouth. Britney was on her knees and must have been sick four or five times. She didn't really seem with it."

The mother-of-two left Malibu's Promises rehab center on March 20 following a month of treatment for alleged alcoholism and post-partum depression. The 25-year-old singer entered rehab after months of excessive partying following the breakdown of her marriage to Kevin Federline.

Britney publicly shaved her hair off and was seen behaving erratically on several occasions before committing to the treatment program.

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