Kevin Federline claims Britney Spears’ "erratic" behavior is "ten times worse" than anything printed in his new memoir.

RadarOnline.com can reveal the pop star's former husband's latest accusation about the Toxic hitmaker's well-being comes after explosive allegations in his book, including that the singer would watch their kids sleep with a knife in her hand . Article continues below advertisement

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Speaking in a new interview to promote You Thought You Knew , Federline — who shares sons Sean Preston , 20, and Jayden James , 19, with the songstress — admits he's had to keep more serious claims out of the book and fears his kids will one day have to "deal with the unimag

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