From Inside Edition.

Britney Spears is fighting back against her ex-husband Kevin Federline and his explosive new-tell book. Spears posted a slew of dancing videos overnight fuming. In his new book, "You Thought You Knew," Federline alleges Spears did "cocaine” while breastfeeding their two sons, among other claims. Spears is firing back saying she feels demoralized and that she has "pleaded and screamed to have a life with her sons," but that they have witnessed a lack of respect by their father towards Spears.