A bombshell letter written by ANGELINA JOLIE reveals she was determined from the start to steal BRAD PITT from JENNIFER ANISTON!

“In the letter, Angelina told Brad that soon after they met, she knew he was the only man that she wanted to have babies with,” an insider revealed.

“She also said it was unfortunate that people were already hurt, but it was fate that they’d be together, and what they had was bigger than anyone or anything – Jennifer Anis­ton included!”

The letter, according to the insider, gives the first glimpse into the Brad-obsessed mind of Angelina, who set her sights on the movie hunk from the day she spotted him on the set of their movie “Mr. & Mrs. Smith” in 2004.

Although the letter was never mailed, details were ob­tained by The ENQUIRER.

It was found on a private jet in August 2005 after Angelina vis­ited Brad in Calgary, Canada, where he was shooting the offbeat historical drama “The Assassination of Jesse James by the Cow­ard Robert Ford.”

 At the time, Brad and Angelina’s relation­ship was already the most talked-about Hollywood romance in decades.

He’d announced his separation from wife Jen in January 2005 and had made his relationship with Angelina public during an April 2005 trip to Africa with the “Tomb Raider” beauty. The letter reveals, however, that Brad had split with Angelina after that trip to Africa, needing time to think if he’d made the right choice.

“Angie wrote that she wasn’t worried as she knew he’d come back to her because they were soul mates,” continued the insider. “She made it clear she knew she was the puppet mas­ter.”

A pal of former “Friends” star Jen added: “Given some time, Jen and Brad may have been able to work things out. But this new information shows Angelina was never going to allow that to happen. Whatever Angie wants, Angie gets.”