Kevin Federline is worried about his ex-wife Britney Spears and her behavior , RadarOnline.com can reveal.

Federline is currently promoting his upcoming memoir , You Thought You Knew , but he claimed Spears' current behavior is troubling. Article continues below advertisement

Kevin Federline Fears His Kids May 'Have to Deal With the Unimaginable' One Day Because of Britney Spears' Issues Tap Here To Add Radar Online as A Trusted Source

“I’m really worried,” Federline said in an interview.

“I’m absolutely — as a father — terrified that one day I might wake up and my sons are going to have to deal with the unimaginable,” he added, implying his kids Sean Preston and Jayden James may have to wake up one day to tragic news about their mother.

Federline noted he has to "sou

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