Jealous Jen 'Furious' Over Emma Stone's Secret Flirt-a-thon With Justin

RadarOnline.com can exclusively reveal Emma Stone has been flirting up a storm with Justin Theroux – and sources say Jennifer Aniston is furious!

"Jen's been keeping a low-profile after the split, so of course it was frustrating to see Justin hanging out at Paris Fashion Week with beautiful women like Emma."

The pair seemingly became close while working together on Maniac, said the snitch, and added a very obvious fact: "not to mention the fact that she's one of the hottest actresses in Hollywood right now!"

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The actresses have met each other a few times on the A-list circuit and they've "always got along really well," dished the informant "so this is a tough pill to swallow, to say the least."

"Jen knows that Justin is going to move on eventually, but she is crushed over the rumors."

As fans know, Aniston and Theroux called it it quits on February 15, 2018 after only two years of marriage.

They tied the knot in August 2015 in a private ceremony at their Bel Air home.