Heidi Bivens: Dumped By Justin Theroux For Jennifer Aniston?

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Heidi Bivens had dated Justin Theroux for 14 YEARS before he began seeing Jennifer Aniston recently, and only moved out of their place last weekend.

That's ... a long time. And a little surprising.

Bivens, 34, a costume designer, has moved out of the NYC home she shared for six years with Theroux, 39, her rep told the NY Post's Page Six:

Heidi Bivens, Justin Theroux
So Lonely

"Heidi and Justin have been together for 14 years. They met when she was 20 and he 24, and yes, she just moved out of their home last weekend."

"She has no further comment."

An insider says he and Aniston, 42, "started hooking up on set" in Georgia last fall while shooting Wanderlust and while he was still with Bivens.

Hard to blame the guy. Have you seen those Jennifer Aniston topless ads for Smartwater? We're kidding ... although we're a little bit serious.

"But he had been trying to leave her for a while," the source said. "He broke it off for good in March," and they were "on an off for years."

Meanwhile, as Bivens packed up her things, Aniston is going public with Theroux, taking their romance public during his extended visit to L.A.

"She doesn't want him to get frustrated with her usual covert way of doing things," a Theroux source said of Jen's new relationship attitude.

"So she's compromising and relaxing about the paparazzi."

[Photos: WENN.com]

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Jennifer Aniston Quotes

I actually feel I've been unbelievably lucky in love. I don't feel like I'm supposed to be any further along or somewhere that I'm not. I'm right where I'm supposed to be.

Jennifer Aniston

You just have to love your life. I have my health, I have my friends, I have my loved ones. I'm extremely lucky.

Jennifer Aniston