Troubled pop star Britney Spears is back to her wild partying ways - the Toxic singer was reportedly seen vomiting violently in the toilets of a Los Angeles hotel at the weekend (27May07). The 25-year-old mother-of-two yesterday (29May07) posted a message on her official website insisting she had entered rehab earlier this year (07) because she had "hit rock bottom" and was "so lost", refuting reports her stay was the result of depression or alcohol abuse. But the superstar has allegedly returned to her pre-rehab days, after she was found slumped over a toilet in Los Angeles' Sky Bar at the Mondrian Hotel on Sunday, crying as she threw up. She was later carried out of the club by hotel staff, according to British newspaper The Sun. Spears was reportedly overheard telling hotel workers: "I'm sorry, I'm sorry. Things aren't going well for me at the moment." A source tells the tabloid, "She had 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 (toilet) bowl throwing up. There was vomit down the front of her black dress and around her mouth."