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Kevin Federline claims his ex-wife, Britney Spears , had a reckless pattern of prioritizing partying over their kids ... and his tell-all memoir details the moment he said enough is enough. Getty

In his newly released book, "You Thought You Knew," Kevin writes, "I was in Miami for work, trying to stay focused on my commitments, and I got a call. It was her, Paris Hilton , and Lindsay Lohan on the line, drunk as hell, begging me to come over. I could hear Preston and Jayden crying in the background. It had to be three or four in the morning. That call was the final straw."

According to K-Fed, it wasn't the first time something like that happened, but it was the one that stuck with him the most. Listenin

"I'd already seen the photos in the tabloids,

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