Written by Melanie Burton, September 21, 2016

Shock news out of Hollywood this morning! After 12 years together and just two years of marriage, Angelina Jolie has filed for divorce from hubby Brad Pitt – after she allegedly found out that he was cheating on her with his French co-star Marion Cotillard.

An insider told The Post on Tuesday: “She hired a private eye because she felt that he was fooling around with her on the set, and it turns out, he was. And that was the final straw.”

There have been rumours for months that Brad and Marion, 40, had been getting close on the set of their World War II drama Allied in London, and the private investigator is believed to have found that Brad, 52, was indeed cheating on Ange – while also partying like a single man!

“The atmosphere [off-set] was full of hard drugs and Russian hookers, and Angie was told Brad got caught up in it,’’ the source said.

“He’s in the throes of some insane midlife crisis, and Angie is fed up.”

Ange’s shocking reason for filing for divorce from Brad… 

A source close to Marion has denied the affair rumours, insisting she’s still with her long-term partner Guillaume Canet.

There have also been reports that Marion is pregnant with her second child with Guillaume.

Ange, 41, is seeking sole physical custody of her and Brad’s six children, Maddox, 15, Pax, 12, Zahara, 11, Shiloh, 10, and twins Knox and Vivienne, eight.

Ange’s manager Geyer Kosinski told E! News: “Angelina will always do what’s in the best interest of taking care of her family. She appreciates everyone’s understanding of their need for privacy at this time.’’

Brad broke his silence on the divorce in his own statement to People magazine, admitting: “I am very saddened by this, but what matters most now is the well-being of our kids.

“I kindly ask the press to give them the space they deserve during this challenging time.”

In addition to Brad’s alleged affair, there are claims that the divorce was brought on by the couple’s conflicting lifestyles and increasingly separate lives.

“The older she gets, the more serious she becomes, and she is sick of the Hollywood thing,’’ a source told The Post.

“He wants to make movies. She doesn’t. It’s a fundamental difference. It’s how you live your life.’’

Another source revealed to TMZ that Ange thinks Brad’s drinking and pot-smoking is affecting their kids, and that his “anger problem” was the final straw.

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