NEED TO KNOW

Kevin Federline writes in his new book that he learned Britney Spears had filed for divorce from a TV producer, just moments before going live on air for an interview

Spears has previously said she filed first because she didn't want to be "humiliated" by Federline

His memoir You Thought You Knew is out Oct. 21

. Kevin Federline is opening up about the moment he learned, just moments before going live on air for a TV interview, that then-wife Britney Spears had filed for divorce.

Federline, 47, recounted the November 2006 moment, which he said “blindsided” him, in his new memoir You Thought You Knew , which hits shelves on Oct. 21.

At the time, Federline was promoting his album Playing with Fire , and had traveled to Canada to appear on MuchMusic. But back at

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