Britney SpearsBritney Spears reportedly found another woman in now estranged husband Kevin Federline’s hotel room last weekend, prompting her to finally file for divorce.

According to the News of the World, Britney flew into New York last week ahead of Kevin’s gig last Saturday at Webster Hall in the city but when Kevin failed to show up for a dinner date with his wife on the Thursday night, Britney demanded the keys to his room at the Regency Hotel.

A source told the paper: “It is against the hotel’s policy to give keys to people not staying in the hotel, but she was so upset that when she demanded it they handed it straight over.

“She raced up to his room and found another girl in there.

“They didn’t need to be doing anything. Just the fact she was in there was enough to confirm months of suspicions, rumours and accusations about him playing away.

“Two members of staff were fired for handing over the keys, but the damage was done.

“Britney had seen all she had to and decided their marriage was over on the spot.”

The newspaper also claimed Kevin had partied with prostitutes and strippers during his jaunts to Las Vegas, particularly while Britney was heavily pregnant with their two sons.

Danielle Coakley, a 20 year old prostitute, told the paper she partied with Kevin one night: “[He] was a real party animal. We went to two casinos then back to his hotel suite in Vegas. There were lots of drugs - cocaine, weed and ecstasy. We shared an E in his limo on the way then passed out on his bed.”

A stripper, Vanessa Hulihan, also revealed she spent time with him during his Vegas weekends: “Kevin said we could be together if he wasn’t married. Another time I went to his hotel suite and the tub was full of strippers.”