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Kevin Federline claims that he once found ex-wife Britney Spears cheating on him with a female dancer

In an excerpt from his memoir You Thought You Knew shared with USA TODAY , the dancer and actor writes that he "wanted out" after that discovery

You Thought You Knew is out Tuesday, Oct. 21

Kevin Federline claims his ex-wife Britney Spears , with whom he shares two children , cheated on him with a woman, according to an excerpt of his upcoming memoir shared by USA Today .

In his memoir You Thought You Knew , Federline, 47, writes about a challenging experience early on his relationship with the pop star when, he claims, he found her kissing a female dancer in Amsterdam while on tour.

Spears, 43, and Federline met in 2004. In his book, Federline write

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