Kevin Federline has Britney Spears on edge about what he might say in his upcoming book! As you likely heard, the former professional dancer is releasing a tell-all memoir called You Thought You Knew later this month. It comes nearly two years after the singer dropped The Woman In Me, where she spilled tea about their relationship. Now K-Fed is sharing his side of the story! And it has Brit "nervous as hell!" That's what a new report claims! Contents [hide] 1 Surprise! 2 MAD?? 3 Another Ex's Take 4 Other Looming Family Issues Surprise! According to a source spilling to Dailymail.