Troubled pop star Britney Spears shocked crewmembers with a dodgy dance routine during a video shoot.
The incident happened a few minutes after the Toxic star gave a disastrous interview to OK! Magazine.
To worsen things, Spears also started 'sobbing hysterically', reports News of the World.
The source added that she kept drinking Red Bull energy drink throughout the 18-hour session.
"She was completely uncooperative and left everyone hanging about when she went for an hour's massage — twice. She just didn't want to cooperate and was snotty and rude to everyone — behaving like a complete and utter spoilt brat," a source said.
"When she wasn't p*****g people off, Britney was smoking like a chimney. She didn't eat or drink anything other than can after can of Red Bull. She could have drank 20 of them all told,'" the source added.
The source also said that Spears had a problem with extras hanging around when she did her pole dance, and that she began struggling with the moves.
"She had a problem with the extras being about when she did the pole dance. She was shy or embarrassed or something and she really started struggling with the whole thing," the source said.
The source added that she threw a fit and left the set in a huff, but she later returned sobbing hysterically.
However, the director had to wrap up because it was already past midnight.
"You could see she was getting a bit wobbly but no one expected her to throw a complete fit. Suddenly she was in floods of tears and stormed off set. She eventually came back but was sobbing hysterically. All her make-up had run. By now it was nearly midnight and the director just called things to an end and sent people home. It was a total shambles," the source added.
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