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 Spears shares two children with her ex-husband Kevin Federline. The "Toxic" singer's first son Sean Preston was born on September 14, 2005. Little brother Jayden James arrived almost exactly one year later, on September 12, 2006. "It's hard enough ...