He added that he felt as though Spears was “not over” her relationship with Timberlake at the time.

With his debut memoir “You Thought You Knew,” Kevin Federline is telling his side of the story.

“They would awaken sometimes at night to find her standing silently in the doorway, watching them sleep — ‘Oh, you’re awake?’ — with a knife in her hand,” Federline writes, according to the New York T...