Jennifer Aniston and Justin Theroux may be at odds due to one of the actor's ex-girlfriends.

As the couple reportedly plans to purchase a vacation home, the Friends actress is determined to steer clear of Hawaii due to the time Theroux previously spent on the island with his former girlfriend of 14 years, Heidi Bivens.

“Jen isn’t a big fan of Hawaii, she only went there because Justin begged her,” an insider explained to Radar Online on Saturday. “He still owns his place on Kauai’s north shore and feels like it’s paradise there, but she finds the place boring... Not only is it too rustic for her tastes, it’s also synonymous with his time with Heidi [Bivens]."

“Jen hates that,” the source said, adding that Aniston was planning to veto Theroux's Hawaiian dreams and force him to “buy a property in Mexico," she is her favorite vacation spot.

“Justin’s snobby about Mexico and is refusing to do any house hunting in Cabo, even though Jen’s been on him about this for months,” said the source. “It’s a real issue that’s caused a ton of fights.”

A while back, Bivens' mother spoke to Radar Online about Theroux's relationship with Aniston, revealing that her daughter was completely blindsided by the romance, which Theroux initially denied.

“Heidi told me what Justin had told her, that something was going to be written about him and Jennifer, that something was going on between them and he wanted her to know that it was nothing, there was nothing to it,” Marilyn Bivens told the outlet. “Out of his own mouth he told my daughter there was nothing to [the news he was involved with Jennifer].”