Kevin Federline set to release memoir in October Kevin Federline has announced plans to release his memoir in October. 6 August 2025 Kevin Federline is set to release a memoir. Kevin Federline plans to release a memoir in October The 47-year-old star - who was married to Britney Spears between 2004 and 2007 - is set to release You Thought You Knew, via the new audio imprint Listenin, on October 21. Kevin said: "This book is extremely intimate and transparent.