Kevin Federline is sharing his side of the story.

Nearly 20 years after Britney Spears stunned the public in 2007 by shaving her head , her ex-husband detailed what happened just before the "Gimme More" singer stepped into the hair salon amid their divorce proceedings.

Federline alleged in his new memoir You Thought You Knew that Spears had checked herself out of a rehab facility and "showed up at the gate, ringing the bell and shouting a bunch of things that didn't make sense."

"The only words that came through clearly were: LET. ME. IN. Over and over again," the dancer—who shares sons Sean , 20, and Jayden , 19, with Spears—wrote. "Then she started climbing the front gate … I stayed inside with the kids, trying to keep things calm. I couldn't stand to se

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