Kevin Federline has addressed speculation that his upcoming memoir, You Thought You Knew, was motivated by the end of Britney Spears’ child support payments. In an interview with Entertainment Tonight on October 14, 2025, Federline was asked whether the book’s timing was linked to Spears’ payments ending. He replied, saying,"You want to go there right away? Alright. I’d be lying if I said that I didn’t want this book to be successful. I wish I’ll sell a million books or more, or whatever.”However, he clarified that "money is not at the root of this story, [and] it never has been"Kevin Federline, who shares sons Sean Preston, 20, and Jayden James, 19, with Britney Spears, said the project was years in the making because he wanted his children to be old enough to understand the book’s intent."Everything has always been about my family."His memoir, running 228 pages, will be released on October 21, 2025.Kevin Federline’s Net WorthAs of late 2025, Kevin Federline’s net worth is estimated at $700,000, according to Celebrity Net Worth. He first rose to fame in the early 2000s as a backup dancer for stars such as Michael Jackson, Pink, and Destiny’s Child. His marriage to Spears, from 2004 to 2007, brought him into the public eye, as did their short-lived UPN reality show Britney & Kevin: Chaotic.Following the couple’s separation in 2007, Britney Spears reportedly began paying Kevin Federline $20,000 per month in spousal and child support, which was later increased to approximately $40,000. Until their younger son, Jayden, turned 18 in September 2024, Spears reportedly paid Federline an estimated $5 million in total child support.Kevin Federline’s entertainment career spans music, modeling, and television. His 2006 album Playing with Fire was reportedly met with poor reviews. He also appeared on screen in shows like Will & Grace, CSI: Crime Scene Investigation, and One Tree Hill. He has also acted in films including You Got Served (2004) and American Pie Presents: The Book of Love (2009).In 2006, he became the face of Blue Marlin’s Five Star Vintage clothing line and made appearances in professional wrestling and advertising, notably defeating John Cena in a scripted WWE Raw match and starring in a 2007 Super Bowl commercial for Nationwide Insurance.More about Federline's memoirKevin Federline said that You Thought You Knew was written to tell his story from his own perspective, not as a reaction to Spears’ 2023 memoir The Woman in Me.Speaking to US Weekly, a source close to Federline said that he wanted fans to hear “his side of the story in depth” after years of limited interviews."Kevin spent about three or four years working on the book."However, controversy resurfaced after Britney Spears’ representative reportedly told Us Weekly that the memoir’s release “comes after child support has ended with Kevin,” accusing him of “profiting off her.”The statement emphasized that Spears, now 43, prioritizes her children’s well-being above all: "All she cares about are her kids, Sean Preston and Jayden James, and their well-being during this sensationalism."Buzzing Pop @BuzzingPopLINKBritney Spears’ rep responds to Kevin Federline’s claims that he fears for their sons after they allegedly saw the star standing in a bedroom doorway holding a knife: “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.”Britney Spears Enjoys A Family Outing At Planet Hollywood Disney Springs (Image via Getty)Kevin Federline acknowledged he has not spoken directly to Britney Spears “in years” but hears about her through their sons. “I’m really worried,” he told Entertainment Tonight. "I’m absolutely, as a father, terrified that one day I might wake up and my sons are going to have to deal with the unimaginable. I kind of have to sound the alarm that I truly feel that somehow, some way, I just wish that their mom would get help."Now 47, Kevin Federline’s memoir release follows a long career defined by public scrutiny and family-centered narratives. While his financial history and Spears’ child support payments have drawn attention, Federline maintains that You Thought You Knew is not a money-making project, but a personal account written for his children and those closest to him.