Britney Spears has slammed ex-husband Kevin Federline over his upcoming memoir, accusing him of ‘gaslighting’ her, and lashed out at their sons in a scathing new post. The superstar, 43, hit out at Federline, 47, and their two sons, Sean Preston, 19, and Jayden, 18, following her ex’s recent shocking claim that their boys would wake up to find her […]