Britney Spears has reportedly signed a deal with US magazine Vanity Fair to tell all about her failed marriage to Kevin Federline. The TOXIC singer was so impressed by the publication's heartfelt interview with Jennifer Aniston following her split from Brad Pitt, she plans to lift the lid on her two-year union with the aspiring rapper. A source tells British newspaper The Sun, "Britney has agreed to make Vanity Fair her first big statement about her new life. "The interview will be very frank. She liked how they handled Jennifer's first interview after her divorce from Brad Pitt."