Jennifer Aniston, who's rumored to be pregnant, is reportedly fighting non-stop with Justin Theroux and now new allegations claimed that their wedding is in peril after he cheated.

The tabloid Star Magazine, as shared by Belfast Telegraph, claimed that Jennifer and fiancé Justin Theroux are "in a terrible place right now."

"They are never together, and even when they are together they fight nonstop," the source claimed.

Their fights seemed to be centered on the allegedly pregnant Jennifer Aniston's suspicions that even before their wedding, Justin Theroux is allegedly cheating with one of the crew of "The Leftovers," which is also the reason why he didn't want him to visit the set.

The source said, "[He was] adamantly against it because he didn't want the stress of having to deal with her while working on an important project. "He started realizing that he's enjoying his independence, he is in no hurry."

On the cheating rumors with Justin Theroux, the Star claimed, "[Jen's] always said that she knew this would happen, that she'd run into the girl so she immediately asked this blonde [about the nature of her relationship] with Justin I mean, it was ballsy. This woman was so taken aback she look like she was about to die."

As a result, Justin Theroux was reportedly embarrassed by Jennifer Aniston's behavior, "Especially considering the fact that their relationship is hanging by a thread, he couldn't believe that Jen would go so far as to confront the girl about it. They had a huge fight over the phone."

"Since the cheating rumors surfaced, Jennifer and Justin haven't been seen together in public in over three months, and the last time they did step out for Robert DeNiro's birthday party - they got in to a fight in front of everyone!" said Celebrity Dirty Laundry.

Amid the rumors of cheating and that their wedding is in danger, Jennifer Aniston was rumored to be pregnant with Justin Theroux's baby, according to Life & Style magazine.

"At first, Jen felt total disbelief and shock. But that feeling quickly turned into complete joy," the source told the magazine. "That's when Justin suggested she take a pregnancy test. Jen blew him off and told him he was being ridiculous. So they made a jokey $50 bet over whether or not she was pregnant."