Angelina Jolie's Oscar nomination celebrations have been marred by reports her former bodyguard is planning a tell-all which will set out to prove the actress moved in on partner Brad Pitt when he was still married to Jennifer Aniston.

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Sources claim the actress, who was nominated for a Best Actress Academy Award on Thursday, is seeking legal counsel to block Mickey Brett's expose, which will also expose intimate details of her courtship and sex life with Pitt.

An publishing insider tells In Touch Weekly magazine, "He (Brett) knows everything about Angelina. It's going to be one of the most explosive books ever written."

Brett, who headed up the Jolie/Pitt's security detail when the couple went into hiding in Namibia before the birth of baby daughter Shiloh in 2006, was reportedly fired by Pitt last year.

The source tells In Touch Brett never signed a confidentiality agreement and could be in the clear when it comes to revealing all about the Hollywood couple.

The insider also tells the publication, "It (book) will include all the sordid details of how they (Pitt and Jolie) got together while Brad was still married to Jennifer Aniston."

Pitt attempted to clear up those rumors in a recent interview after Jolie revealed the couple had met and fallen in love on the set of action film Mr. and Mrs. Smith, which was made when the movie hunk was still married. He insisted there was no "dastardly affair."

(This news article provided by World Entertainment News Network)