Britney Spears is in a state of panic over her ex-husband Kevin Federline 's forthcoming memoir as she fears he's set to spill her se secrets, RadarOnline.com can reveal. The 43-year-old singer, who last year released her bestselling autobiography The Woman in Me , is unsettled at the prospect of her former partner presenting his version of events of their turbulent marriage, sources tell us.

Federline, 47, has confirmed his book – titled You Thought You Knew – will recount his childhood, career as a professional dancer, and marriage to Spears, which collapsed in 2006 under intense media scrutiny. Article continues below advertisement

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