Kevin Federline is looking back at a moment that changed his marriage to Britney Spears for good. According to People on Friday, the 47-year-old former dancer wrote in his memoir, You Thought You Knew, about an argument the former couple got into over him smoking weed in their house. Britney revealed in her own book [...] Read More... The post Kevin Federline Claims Britney Spears Slapped Him While She Was Holding Their Son -- But Why?? appeared first on Perez Hilton.