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Pop star Britney Spears<\/a>‘ ex-husband Kevin Federline claims she cheated on him with a woman inhis upcoming bombshell memoir<\/a>.<\/p>\n In You Thought You Knew, which is set to debut on Oct. 21, the 47-year-old promises to delve deep into the “extremely intimate and transparent” details about their “highly publicized marriage.”<\/p>\n Since the news of the memoir broke, the music<\/a> icon’s star’s family has expressed concerns over Spears, who is reportedly “living on the edge mentally,”<\/a> and the contents could potentially make her “spiral.”<\/p>\n Federline has already released snippets regarding his high-profile marriage to the pop star, including one that claims that their two adult sons have confided in him about her troubling behavior.<\/p>\n In excerpt shared by USA Today<\/a>, the DJ writes about an experience early on in the former couple’s relationship when, he claims, he found her kissing a female dancer in Amsterdam while on tour.<\/p>\n<\/div>\n In his book, Federline writes that he and the singer had gone out with some of her tour dancers and staff, including a woman who introduced the then-couple in 2004. After the night out, the group returned to the hotel.<\/p>\n Federline writes that he found Spears in a hotel room and claims the other woman, “was sitting on the edge of the bed. Britney stood between her legs, hands on her face, and they were (expletive) going at it. Full-on making out,” Federline writes.<\/p>\n He adds that he was “stunned,” according to USA Today.<\/p>\n Federline alleges that the incident made him realize this wasn’t what he “signed up for,” and began packing.<\/p>\n He writes that he “wanted out” and planned to fly back to the US before Spears apologized and promised it wouldn’t happen again.<\/p>\n Federline writes that he wanted a monogamous relationship and set that boundary. However, he claims, the moment was a “turning point” for their relationship and ended up bringing them closer together.<\/p>\n DON’T MISS:<\/strong><\/p>\n Britney Spears fans slam singer for allowing son Jayden to perform illegal act<\/a><\/strong><\/p>\n Britney Spears claims flight attendant tried to ’embarrass’ her on plane<\/a><\/strong><\/p>\n