Britney's £10k bill after she vomits on dress during photoshoot

The editor of OK! magazine has said her staff were left "shocked and saddened" by the star's latest photo shoot - and out of pocket.

Britney left a bill of more than £10,000 after walking away with designer goods and leaving a number of items damaged.

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The singer, whose bizarre behaviour has heightened fears she is spiralling out of control, also let her Yoarkshire terrier defecate on a £3,350 Zac Posen gown.

It's not the first time the star has been seen in a mess in recent times - while visiting a bar in West Hollywood on Monday, the dazed looking star was seen with food smeared across her face.

The magazine decided not to print the pictures because they "weren't up to standard."

Spears was also said to have been "babbling incoherently, talking in baby talk" throughout the shoot.

OK! editor-in-chief Sarah Ivens said: "I've never seen anything like it," adding, "It's definitely the most bizarre shoot I've ever been on."

Spears had offered an exclusive interview that was intended as career comeback for the 25-year-old pop singer, Ivens said.

"What actually transpired on the day was a shock to us and left me and the whole crew feeling quite shocked and sad, really," she said.

During the shoot, Spears wiped grease on a designer dress, treating it like "a napkin," said Ivens.

"I wasn't in the room but I was there to hear the upset shrieks of the stylist," Ivens said. "Her assistant dealt with it in the end, after being asked to take care of it. They had to be asked to clear it up."

Spears took frequent trips to the bathroom - leaving the door open - and complained that the high-end clothing put together for the July 19 shoot was not sexy, short or tight enough, the magazine said.

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After about three hours, Spears bolted before the shoot was over, walking away with more than £7,000 of borrowed apparel, Ivens said.

Sources have described the star as "completely out of it" during a photoshoot and the photos are so bad that to publish them could "kill her career", according to reports.

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One witness told The Sun: "Britney was in a shocking state. She was babbling incoherently, talking in baby talk. She didn't make sense.

"She went to the toilet and when she came back she couldn't continue with the interview.

"Her eyes were rolling back, she was talking nonsense. She ate some food and vomited over her Gucci dress. She was a mess.

"She also seemed to be hallucinating, and kept saying strange and worrying things."

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Her mood, sources claim, was extremely erratic, and she was reportedly fearing the ceiling was about to cave in on her.

Earlier this month, the pop princess apologised for attacking a photographer's car with an umbrella in February, saying at the time she was preparing to try out for a movie part and got carried away.

The incident took place during the same period in which Spears shaved her head, got new tattoos and was seen partying hard in Los Angeles clubs.

Soon after, the singer checked into a month-long stay in rehab.

She is now estranged from her mother Lynne Spears and former manager Larry Rudolph, reportedly over their involvement in getting her to check into the facilty.

Spears filed for divorce from aspiring rapper Kevin Federline in November, just two months after giving birth to the couple's second child, Jayden James. Their older son, Sean Preston, was born in September 2005.