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Britney Spears would sometimes stand outside of her sons’ room when they were at her house with a knife while they slept, ex-husband Kevin Federline has claimed.

"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," the former backup dancer wrote in his upcoming memoir "You Thought You Knew," according to The New York Times . "Then she’d turn around and pad off without explanation."

Fox News Digital has reached out to Spears' reps for comment.

A rep for Spears told US Weekly : "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 Kevi

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