Kevin Federline is pulling back the curtain on his life before, during and after his marriage to Britney Spears in a new memoir coming out this fall. "This book is extremely intimate and transparent," Federline, 47, said in a press release on Wednesday, August 6, of his upcoming release, You Thought You Knew. He hinted that the book will touch upon his and Spears' time together, saying, "I achieved my biggest dreams, dealt with crushing heartbreak and endured constant ridicule, all while becoming the father my children needed as they experienced nonstop emotional turbulence.