Jennifer Aniston and Justin Theroux are reportedly having a major fight over her "Zoolander 2" cameo. It was said that the "Friends" star was regretting her decision to help her fiancé out with the sequel.

According to Radar Online, Jennifer Aniston and Justin Theroux have been arguing nonstop about her cameo after receiving unreasonable demands from her fiancé.

"Jen's ready to pull the plug on her cameo after 'an inch became a mile' with Justin's demands," the source said.

The actress was reportedly furious when Justin and his co-star Ben Stiller asked her to go to ComicCon to promote "Zoolander 2." It was said that she felt that she was already doing so much, given that she already made time to do a cameo despite her busy schedule.

"Justin and Ben want to go to ComicCon and do some publicity stunts for the movie and he's been begging her to get involved," the insider said.

"Jen's already agreed to do a small cameo in the movie, but lining her up for some cheap publicity trick is not how she wants to roll anymore."

Justin reportedly still could not take a hint and decided to push the issue further, which is when Jennifer lost it. She was allegedly tired of giving in to his every wishes. She also did not want to be part of a childish publicity stunt especially when she wanted to be known as a serious actress.

"Jen lost it, telling him he's forgetting who she is and that she's not some on-call piece of arm candy."

"Expecting her to line herself up for a prank when she's desperately trying to find a serious dramatic role is not fair," the insider said.

"Justin forgets just how much she's done for him. He should be grateful she's agreed to do that cameo, not demanding more."