NEW YORK, NY. May 4 (TOTI) --

It's difficult to trust anyone, especially if you're Angelina Jolie and Brad Pitt.

In what could be one of the biggest blows to the Hollywood power couple, their former bodyguard, Mickey Brett, is said to be penning a nasty tell-all book about Brangelina.

Brett, who worked for Angelina prior to her relationship with Pitt, was fired in 2008 and gained notoriety after he attacked several Indian citizens while Angelina was filming the 2007 film, A Mighty Heart, has plenty to dish on, including secrets about parenting, their relationship and their sex life.

A source told Life & Style, "It's hard to think of a bigger betrayal in Angelina's life than Brett going out and attempting to profit from his time with Angelina and the rest of the family."

But don't get too excited about the tell-all book just yet. Jolie and Pitt aren't called a "Power Couple" for nothing and a confidentiality agreement could bind Brett's silence.

The source continued, "They knew this was coming and have been planning to defend against it for months. They're certain they're going to come out on top."

Brett denied intentions to write the book, but the real threat to the couple lies in what he knows, since he was privy to the workings of their relationship since the very beginning.

Whether the book ever makes it to print edition remains to be seen.

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