Robert Pattinson and Kristen Stewart reportedly had a fight on the set of 'The Twilight Saga: Eclipse'.

The couple were on a reshoot in Vancouver, Canada, for the third instalment of the vampire film series when the argument erupted after Robert arrived late on the set, with Kristen accusing him of spending time in a racy burlesque club.

"When Robert arrived, he and Kristen started fighting. She accused him of taking a later flight from London because he had been hanging out too late at a burlesque bar. She accused him right in front of the director and crew."

Robert - who today (13.05.10) celebrates his 24th birthday - did not take the accusation well and the cast and crew had to take a break.

The onlooker added to the New York Post newspaper: "He didn't take it well. They were both so angry, the crew had to take a break for an hour for things to simmer down."

A spokesperson for the film's studio Summit Entertainment denied any row occurred, and insists Robert wasn't even late.

The representative said: "Rob was not late on set, he arrived later because he had a different call time than other cast members. There was no row or ill feeling at all. Everything went very well."

Kristen recently admitted she doesn't want to talk about her relationship with Robert publicly because she it "cheapens" their feelings.

She said: "I would never cheapen my relationships by talking about them. People say, 'Just say who you're dating. Then people will stop being so ravenous about it.' It's like, 'No they won't!' They'll ask for specifics."