The Britney Spears saga is about to take another hairpin turn with the Oct. 21 release of ex-husband Kevin Federline ‘s shocking tell-all, You Thought You Knew . The memoir details Federline’s journey from the streets of Fresno to Hollywood, where he once showed enough raw dance talent to be cast by Michael Jackson in what would turn out to be the singer’s final music video.

But the bulk of the story belongs to Federline’s tumultuous two-year marriage to — and ensuing co-parenting arrangement with — Spears. Unlike the tale of a former child star pushed to her limits in her own autobiography, The Woman in Me (soon to be a Universal film from Wicked director Jon M. Chu), Federline’s version paints the pop icon as a deeply volatile figure who put their two sons in precarious si

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