Despite publicly calling Angelina Jolie “uncool” for breaking up her marriage to Brad Pitt, it seems Jennifer Aniston is perfectly cool with destroying “Wanderlust” co-star Justin Theroux’s fourteen year relationship with his live-in girlfriend. Funny how that works, isn’t it? Page Six says:

Hollywood costume designer Heidi Bivens “is devastated” after Theroux abruptly ended their relationship as he got close to Aniston.

Aniston, 42, and Theroux, 39, met last fall on the set of “Wanderlust,” due in October, but in recent weeks they have become inseparable.

A source told us, “Heidi is heartbroken. She was completely blindsided. She and Justin had been together for years, they had a home. Then he met Jennifer and everything changed. At first he claimed he and Jen were friends.”

A rep for Bivens confirmed: “Heidi and Justin have been together for 14 years. They met when she was 20 years old and he 24, and yes, she just moved out of their home last weekend. She has no comment.”

When Aniston and Theroux were first spotted dining together in May, her rep insisted they were friends. But in recent weeks, the pair have repeatedly been seen dining out and reportedly spending weekends together, with Hollywood sources telling us that “things are moving fast. They are practically living together.”

A rep for Aniston… declined to comment.

“No comment,” huh? So she can dish it out, but she can’t take it. Just like a husband when you decide you want to experiment with a strap-on. That’s a double standard right there!

In next month’s Marie Claire:

More of her in New York showing off her rack:

PHOTO SOURCE: Fame Pictures