Kevin Federline has taken a vicious jab at Britney Spears ’ parenting skills, RadarOnline.com can reveal.

Federline’s memoir, You Thought You Knew , is coming out on October 24 and has been garnering a lot of buzz. Article continues below advertisement

Kevin Federline Responds to Insulting Britney Spears' Parenting Skills Tap Here To Add Radar Online as A Trusted Source

In one line in the book, he describes Spears’ behavior around her children as "Joan Crawford on crack."

When asked about that, Federline dished to a news outlet: "All of it has been terrifying, and it’s a lot to handle as a parent. Navigating all of those things was very difficult. But honestly, I couldn’t tell you, because it wasn’t happening over at my house. So I don’t know exactly what all was going on.

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