Britney Spears’ representatives have hit back after Kevin Federline claimed she used to stand in their sons’ bedroom doorway, holding a knife as they slept.

In his new memoir, You Thought You Knew, the dancer promised an ‘extremely intimate and transparent’ look at his life, including with the pop superstar.

Britney, 43, and Kevin, 47, were together from 2004 to 2007, tying the knot just three months into dating.

They welcomed sons Sean Preston and Jayden James during their relationship, with a messy custody battle unfolding after their divorce.

In an excerpt seen in The New York Times, Kevin alleged that the boys feared staying at their mum’s home due to her erratic behaviour.

He wrote: They would awaken sometimes at night to find her standing silently in the doorway, watching them s

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