Angelina's Bodyguard Says Brad Cheated on Jen!!!

Angelina is reportedly trying to stop a former bodyguard from writing a "tell all" memoir that will reveal she and Brad had sex while he was still married to Jennifer Aniston, In Touch Weekly is reporting.

"[The bodyguard] knows everything. It's going to be one of the most explosive books ever written," a publishing insider tells the magazine.

The book would reportedly refute Brad's claim there was no "dastardly affair" with Angelina during the filming of Mr & Mrs Smith while he was still married to Jen.

The former bodyguard, who Brad reportedly fired last year, apparently never signed a confidentiality agreement so the Jolie-Pitts could have a tough time trying to keep this book from being published.