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Kevin Federline's new memoir recalls the night in 2008 when ex-wife Britney Spears was placed under a psychiatric hold after locking herself in the bathroom with their son

Federline called the pair's custody battle "crushing"

Spears has publicly slammed Federline's book

Kevin Federline is reflecting on the difficult night that his ex-wife Britney Spears was placed under a psychiatric hold after locking herself in the bathroom with their toddler son.

Federline, 47, recalled the January 2008 incident in his new memoir You Thought You Knew , writing that sons Sean Preston , now 20, and Jayden James , now 19, had spent the afternoon with Spears, 43, and were in the process of going back to his house when things went “sideways.”

The former dancer wrote that he sent

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