K-Fed threatening to sell 4-hours long sexual tape with Britney Spears Dumped husband Kevin Federline has been touting the four- hour tape for sale and has already been offered £26 MILLION. ($50 million) A film company wants to make it available online to fans around the world. One close pal said: "This vid is dynamite and Kev knows it." And the News of the World can also reveal that Britney slapped divorce papers on Federlinewho had already been linked with hookersafter she caught him in a bedroom with another woman. Britney, 24, fears the raunchy footage will destroy her wholesome image unless she caves in to his demands for a £16million payoff and custody of their children Sean Preston, one, and Jayden James, eight weeks. She is worried she will become infamous like Paris Hilton whose home-made sex video, was put on the internet by her ex and became one of the world's most popular sites. Federline, 28, has bragged to pals that his X-rated tape shows the Oops, I Did It Again singer performing a series of explicit sex acts. The home-made video is believed to show the naked couple enjoying an uninhibited range of love-making and sexual games.It was made during the first weeks of their relationship two years ago when they were holed up in one of the exclusive bungalows at the Beverly Hills Hotel in Los Angeles. The source close to Federline said: "At the time the two of them were in the honeymoon stages of the relationship and couldn't keep their hands off each other. "They did nothing all day but have sexand play the odd game of chess. "They were insatiable and they believed they would be together forever. "Britney didn't think twice about making the video at the time. She mistakenly believed that their love would last. "They adored filming each other. They lived their lives in front of the cameraseven making a short-lived reality TV show of their exploits. "Sex was no different to them, it seems. Now this video could prove very costly to her. "Millions of people will be prepared to pay to watch. "Kevin has told Britney she should comply with his demands otherwise the whole world will see her having sex, which will be devastating." He added: "At the moment Kev is in talks with a company in Arizona about putting the four-hour sex vid online. If it all goes to plan he'll make £26million from it." The source explained that Federline is so enraged with his estranged wife he will do anything to hurt her. "Britney has contacted her lawyers to see how she can stop him but it is going to be a hard one. It is his tape, so in theory he owns the copyright." We can reveal Britneyworth at least £50million after hits like Hit Me Baby One More Timefiled for divorce after she stormed into his hotel room and found him with another woman. The singer flew into New York a day after her wannabe rapper husband to join his tour. But he stood her up at The Library restaurant, and she was seen in floods of tears before storming to the Regency Hotel where he was staying. A source said: "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." Last week she filed for divorce after dumping him by text. Federline is only entitled to £2million and half the sale of their £7million home in Santa Barbara because of the watertight pre-nuptial agreement they signed before they wed. Britney also gets to take back his £78,000 Ferrari, custom- made motorbike and any gifts worth more than £6,000. Two days later Federline filed his own divorce petition. He is demanding £16million, custody of their children and for Britney to pay his legal fees and maintenance. A pal said: "The bid for custody of the kids was a warning shot that Kevin means business. "And, more importantly, that he is NOT going to go away quietly with his pre-nup pittance. "He wants an awful lot more. and he'll most likely get it." But the star put a brave face on her troubles this week as she celebrated her freedom. She was spotted beaming away in a big baggy jumper at an ice rink in New York. Giggling as she took a twirl, the singer was filmed by a fan.