Jennifer Aniston's wedding to fiancé Justin Theroux will take place in an island if everything goes according to plan as the "Horrible Bosses" actress has reportedly already started on a diet to make sure she will rock her wedding dress.

Jennifer Aniston and Justin Theroux are reportedly scouring for locations for their upcoming wedding, E! News reported.

The "Horrible Bosses" star, who just turned 45 on February 11, is reportedly on a diet to star in the indie film "Cake," where she will play a character of an bitter woman who becomes infatuated by the case of another woman who committed suicide. Jennifer Aniston will also executive produce the film.

But E! claimed it's not the only reason why the actress is on diet, as it's all part of Jennifer Aniston's wedding plans with Justin Theroux.

A source told the news site that Justin Theroux and Jennifer Aniston wedding will probably take place later in 2014, "no sooner than late summer or early fall."

The insider also claimed that Jennifer Aniston wanted "to have an island wedding."

Jennifer Aniston and Justin Theroux were lately the subject of rumors that they were headed for splitville because of the long periods they were away from each other. The actor was busy filming his HBO series "The Leftovers" in New York while she stayed in Beverly Hills.

It seemed that the breakup between Jennifer Aniston and Justin Theroux might have happened after a new report came out that "The Leftovers" actor doesn't really like her frienship with Chelsea Handler.

The March 24 issue of Star reported that Justin Theroux-Jennifer Aniston wedding almost didn't happen because the actor could not stand her BFF, Chelsea Handler, whom he thought was rude and obnoxious."

"He feels she lures Jen to parties and encourages her to act like she's single," the source said.