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Kevin Federline writes in his new memoir he fears ex-wife Britney Spears "situation" is "racing toward something irreversible"

Federline also claims that the pair's sons sometimes saw Spears watching them sleep with a knife in her hand

Federline's memoir You Thought You Knew is out Oct. 21

Kevin Federline is sounding the alarm over allegedly concerning behavior involving his ex-wife Britney Spears , with whom he shares two children , according to an excerpt of his upcoming memoir shared by The New York Times .

Federline, 47, writes in his memoir You Thought You Knew (out Oct. 21) that he fears the pop star’s “situation” is “racing toward something irreversible” — and alleges that his sons claimed that they would sometimes awake at night to find their mom st

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