She's not messing around! Not only is Jennifer Aniston done with her ex-husband Justin Theroux, but with legit anyone who’s worked with him. Forget burning bridges — the Friends actress is burning Hollywood.

"As far as Jen’s concerned, it’s her or Justin and she doesn’t want to be a part of Justin’s social chain," a source told Radar Online. Question is, why now? Selena Gomez, that's why!

"Jen was angry enough to see [Justin] at dinner with Emma Stone, whom she considers a friend. But then she has to contend with new photos of him schmoozing all over Selena Gomez and it’s really tipped her over the edge," the source continued.

In fact, the 49-year-old has reportedly already fired her longtime hairdresser Chris McMillan after he was said to still be working with Justin. That’s how you know a woman is pissed! A good hairstylist is damn hard to find. Certainly a little schmoozing isn’t enough to cut ties with all your employees, right?

Well, as it turns out, Selena and Justin are well-past schmoozing. Things have gotten way more serious than that. "They've known each other for years through their manager," a source explained to Life & Style. "Initially, they leaned on each other for emotional support after going through messy breakups," the source added.

selena gomez and justin theroux 2015

(Selena Gomez and Justin Theroux pictured together in 2015. Photo Credit: Getty Images)

In recent weeks, though, "they've become closer than ever," the source said. "It's turned into something more than friendship." Despite a 21-year age difference (he's 46, she's 25!), says an insider, "Selena and Justin are falling for each other."

Don’t feel too bad for Jen just yet. Another source told Life & Style that despite her reservations to drop this grudge, she too is thinking about robbing the cradle! "Jen’s telling friends that she wants to date a younger guy," they said. Hm, maybe a little cougar action is all it will take for Jen to shake this negativity? Here’s hoping.