Kevin Federline Threatens to Write Britney Spears Expose  12/14/06

Britney Spears' estranged husband Kevin Federline is threatening to write a steamy tell-all book about his marriage to the pop star if he doesn't receive the divorce settlement he feels he deserves.

The book could include details about his estranged wife's wild drinking, alleged drug use, her sexual attraction towards other women, as well as her supposed belief in time-travel.

A source tells American publication Star, "Kevin is either hoping a publisher will pay him big money for the book or that Britney will cough up more cash than what's in their prenup to keep him from spilling the beans."

According to the couple's agreement, Federline could receive an estimated $360,000 in spousal support, plus $7 million from the sale of their Malibu, California home.

He is also requesting sole custody of the couple's two children, Sean Preston and Jayden James, as well as a settlement of at least $20 million.