NEED TO KNOW

Kevin Federline's new memoir You Thought You Knew is out now

In the book, he wrote about allegedly receiving a call from ex-wife Britney Spears while she was partying with Paris Hilton and Lindsay Lohan

"Any deep-seated sliver of hope that I’d held onto, that we might still somehow pull it together for the kids, died right then," he wrote

Kevin Federline is opening up about the "final straw" in his marriage to Britney Spears .

In the 47-year-old former dancer's new memoir, You Thought You Knew , he recalled allegedly getting a call from his then-wife, now 43, while she was hanging out with Paris Hilton and Lindsay Lohan — with her and Federline's sons Sean Preston and Jayden James in the background.

Federline, who was married to Spears from 2004 to 2007,

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