Kevin Federline's Most Explosive Claims In New Book 'You Thought You Knew'

Celebrity By TooFab Staff | 10/16/2025 11:02 AM PT

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Kevin Federline has been making headlines with some of his claims in his upcoming book, You Thought You Knew,' specifically what he's been writing about his ex-wife, Britney Spears. While the book officially drops October 21, excerpts have already started dropping, prompting Spears herself to say the "constant gaslighting from ex-husband is extremely hurtful and exhausting." Her rep added, "With news from Kevin’s book breaking, once again he and others are profiting off her and sadly it comes after child support has ended with Kevin. All she cares about are her kids, Sean Preston and Jayden James, and their well-being during this sensationalism. She detailed her journey in her memoir."

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Kevin Federline claims that one of the final straws to his and Britney Spears' marriage was when he received a drunk phone call from her, Lindsay Lohan and Paris Hilton. Federline alleges he was on a business trip when his phone rang and he heard the trio, "drunk as hell, begging me to come over. I could hear Preston and Jayden crying in the background. It had to be three or four in the morning." He further wrote about his fury, claiming, "I’d already seen the photos in the tabloids, the ones of her out with them all night, partying at Paris’s Malibu place. But hearing my kids crying while she was doing God-knows-what? That was it. Any deep-seated sliver of hope that I’d held onto, that we might still somehow pull it together for the kids, died right then."

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Kevin Federline called out Hollywood elites like Rosie O'Donnell and Jimmy Kimmel for their responses to his and Britney Spears' divorce. Federline accused them of contributing to, "The gossip, the rumors and the public ridicule, it’s all like a high school drama on a massive scale. And while I was lucky to have a strong sense of self by the time fame hit, there were still moments that got to me." The media personality wrote, "They had no clue who I really was, yet still felt entitled to publicly judge me. [...] It wasn’t devastating, but it was frustrating. It made me feel like I was stuck in this caricature." Federline called out O'Donnell for throwing confetti on The View and exclaiming, "Let me just say on behalf of a happy America: Welcome back, Britney! We love you," the day after their divorce was announced. He also called out Kimmel for a skit where he sealed a Federline look alike into a box and threw it into the ocean. Looking back at the moment, Federline claimed, "That moment summed up how the industry treated me, like I was something to be laughed at, thrown away and forgotten."

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How Kevin 'Found Out' Britney Filed For Divorce

In his book, Federline detailed the moment he allegedly learned Spears had filed for divorce. According to Federline, when he was promoting his album at MuchMusic in Canada, production revealed the news of Spears' filing, saying he felt "ambushed." "My brain just… froze. I must've looked like a deer in headlights, staring at the guy like he'd just spoken in tongues," he wrote. "My first thought was, 'What the f--- are you talking about?' Nobody had told me… That's how I found out." While Federline said he was "unraveling" inside, he tried to "keep it together" in the moment. He went on to note that after the taping, his lawyer confirmed the news of Spears' divorce filing, writing that the media had learned it as well. "It was a public unraveling of my life, right in the middle of my album release," he wrote. "Later, Britney claimed that she was legally advised to file for divorce before I got the chance. Her PR team thought that after the [Justin] Timberlake breakup, it would look bad if she was on the receiving end again."

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Bizarre Behavior with Their Sons

In the memoir, Federline claims their sons "would awaken sometimes at night to find her standing silently in the doorway, watching them sleep ... with a knife in her hand." He also wrote the boys said she would feed Jayden shellfish and take him horse riding despite him being allergic to both, while Preston claimed "she had punched him in the face." Kevin also wrote she showed up to his home once unannounced, with "one boob hanging out of a ripped shirt," with a diaper for Jayden, "who hadn't worn a diaper in over a year."

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More "Unsettling" Behavior Before Sons Stopped Seeing Her

Kevin wrote Britney's behavior bizarre continued to escalate, saying the boys once returned home with their hair "bleached down to the scalps," burning their skin. He said Preston was "uncomfortable" she still "kept forcing him to bathe with her" when he was around 10 or 11, and wrote "every visit seemed to end with her yelling about something," prompting the boys to not "want to deal with it anymore." He said, "One night, after another unsettling visit, the boys came home and said, 'We're done. We’re not going back." Federline also claims that during one argument with Preston, Britney told him she wished he, Jayden and Kevin "were all dead."

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Britney Slapped Kevin While She Held Son

Federline claimed that in 2006, after they welcomed son Sean Preston, the two had a fight about Kevin's marijuana use. "Britney came storming into the bedroom, holding Preston, and just ripped into me," he claimed. "She knew who I was. She married me knowing it. But she was on the warpath, shouting her head off. Then she slapped me. Right in the face. With our son in her arms." He said it was "the first time things got physical," but it "wouldn't be the last."

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Jamie Lynn Spears Wrote Letters to Federline & His Wife

Jamie Lynn Spears reportedly unfollowed Kevin Federline on Instagram after comments he made about her in his book, per Us Weekly. Federline claimed that Britney Spears' younger sister wrote him letters praising him for how he and his wife Victoria Prince have raised his sons with Spears. In the letters, he claims Jamie Lynn said she began to resent her sister "for how she treated [her sons] because it was clearly affecting them." She also allegedly wrote that she believed the singer wouldn't get better because she was "incapable" of taking accountability. Federline also writes that Jamie Lynn shared she would understand if they wanted to cut her sister off, claiming she said, "I'm sure my sister has never thanked y'all for raising her children and still being beyond gracious to allow her so many chances to take part in their lives, even when y’all had more than enough reasons to validate cutting that off."

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Federline & Spears Hooked Up The First Night They Met

Kevin Federline unpacked his relationship with Britney Spears from the very beginning, claiming they had sex on the first night they met. The pair were formerly introduced in 2004 at a Hollywood club through their mutual friend, Teresa Espinosa. Federline admits that it felt like "It was just me and her," and he was "just thinking about smashing." Spears, he said, invited her now ex-husband back to her bungalow, which had a private pool and hot tub at the Beverly Hills Hotel. After some time in the hot tub, he said she eventually led him into her bungalow, "turned around, slipped off her underwear and started kissing" and "tearing at [his] clothes with both hands." He wrote that he helped her discard his garments while thinking "This. Is. Happening."

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Spears Hooked Up with One of Her Female Dancers

Federline claimed he walked in on Britney Spears "going at it" with her backup dancer Teresa Espinosa -- who is also the mutual friend who introduced the two. The alleged incident occurred in Amsterdam while he was accompanying her on the European leg of her 2004 Onyx Tour, saying, "Britney stood between her legs, hands on her face, and they were f--king going at it. Full-on making out. It was one of those moments that hits you so fast, your brain can’t even begin to process it." Federline recalled feeling hurt as he was starting to catch serious feelings, while "she told me she didn’t realize how serious I was about us, that she was overwhelmed, and it had been a mistake." Espinosa responded to Federline's allegation after the story started making headlines -- click to read her full response below.

Read Teresa Espinosa's Response

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Spears Drank While on Medication & Pregnant

Federline alleged that his ex-wife, Britney Spears, would drink alcohol while taking medications and pregnant. He wrote, "That mix was… dangerous. F-- up, honestly. You’re not supposed to drink when you’re on meds like that. A couple of glasses of wine for her would hit like a whole bottle because of the medication.” Federline then claimed that he make excuses for Spears alleged behavior, explaining that he knew the singer was under a lot of pressure and believed medications and alcohol to be her coping mechanisms.

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Spears Called Her Ex Justin Timberlake the Night Before Her & Federline's Wedding

Federline felt like Spears never truly got over her ex, Justin Timberlake, and wrote that she called him the night before their wedding. He said he overheard parts of the conversation and began thinking, "'What's wrong?' I thought she was talking to her mom on the phone or something and maybe she was, like, having doubts." He was surprised when the pop star allegedly confessed she'd been on the phone with Timberlake, telling him her "final piece." He said he asked Spears if she wanted to get married, claiming he "didn't care" if they did. They went through with it, however, the whole experience threw Federline off as he wrote, "Damn, on the night before our wedding, this is what you decide to do?"

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Spears Did Cocaine While Still Breast-Feeding Their Sons

Federline shared that the final straw to his and Spears' marriage was when he allegedly caught her snorting cocaine while still breast-feeding their sons Preston and Jayden, who were 13 months and one month old at the time. Federline said he walked in on Spears and her peers during one of his album release parties in 2006, recalling, "The first thing I saw was Britney and her young starlet friend snorting a fat line of coke off the table. Both were wearing these outrageous wigs. Britney’s was electric blue. It was surreal. They didn’t even try to hide it." He said when he asked Britney to not go home and breast feed the kids, to get formula instead, he alleges she threw her drink in his face. He wrote, "That was the proverbial final straw, the breast-feeding thing. Her reaction. That’s what ended us." This, he said, lead to an explosive couple days of him drafting a document that legally demanded Spears stop breast-feeding their sons and her serving him with divorce papers. Federline recalls it being at such a fast pace, "I couldn’t even catch my breath."

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What Happened the Day She Shaved Her Head

Federline also recounted his experience the infamous day Britney Spears shaved her head. Allegedly, before going to the salon, she went to his house first and was "ringing the bell and shouting a bunch of things that didn’t make sense" and tried to scale the gate. Federline did not come out or invite her in because he did not want her to be around their children as, he said, "they wouldn’t have understood why their mom was looking and acting so bizarrely, and I didn’t want to scare them." He then talks about the paparazzi pics: "Her shaved head, the wild look in her eyes. That was the exact energy she brought to my gate earlier."

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Kevin Federline's Most Explosive Claims In New Book 'You Thought You Knew'

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