Britney Spears in 2019Britney Spears’ team has responded to allegations made about the singer by her ex-husband Kevin Federline.The Piece Of Me singer and former back-up dancer were married for three years between 2004 and 2007, during which time they had two sons, Sean Preston and Jayden James.Earlier this week, the New York Times published an excerpt from Kevin’s upcoming memoir You Thought You Knew which contained allegations about the Grammy winner.In his book, Kevin claims that the former couple’s sons would express fear to him at the prospect of staying at Britney’s house, alleging: “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. Then she’d turn around and pad off without explanation.”A spokesperso