Justin Theroux: Cheating on Jennifer Aniston With Liv Tyler?!

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It feels like Jennifer Aniston and Justin Theroux have been engaged for as long as we can remember.

There have been plenty of reports that Jennifer is getting impatient and threatening to call things off if they don't make it official soon, but now it seems like she might not be the only one ready to pull the plug on Hollywood's slowest-moving relationship.

Sources say that Justin and his Leftovers co-star Liv Tyler have been "racking up a lot of alone time on and off set," and it's reportedly driving Jen crazy.

Justin Theroux and Liv Tyler Photo

One insider says the final straw was when Liv began posting photos of herself and Theroux (like the one above) to her Instagram page, and openly talking Justin's "bulge" during promotional interviews.

As you might recall, Jen's had problems with her men falling for their co-stars in the past, so she's said to be particularly wary of the "friendship" between Justin and Liv.

"She went off on Justin and grilled him over the nature of his relationship with Liv," an insider tells Life & Style. "She seems to view Liv as the other woman - and she can't stand her."

Of course, rumors that Justin and Jen are breaking up have plagued the couple pretty much from the start of their relationship. Yet another reason they should just hurry and get pregnant. Then we can all return to good old-fashioned Jennifer Aniston pregnancy rumors.

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Jennifer Aniston Biography

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Jennifer Aniston is beloved throughout Hollywood. She's had a tough personal life, but is still beautiful and a solid actress. More »
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Jennifer Aniston

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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.

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

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