According to a source close to the couple, Aniston, 46, "insisted" she and Theroux invite friends on the trip shortly after their secret 2015 nuptials.
The source revealed the Friends actress thought having friends on the luxurious vacation would "lighten the mood."
"Justin is very serious, all the time, and intense," the source explained. "It's not a good sign of the marriage when the newlyweds have to bring their pals along on the honeymoon."
"Almost all of their vacations were also with their group of friends," the source added. "They were never alone."
Of course, the former couple was also rocked by the death of a honeymoon guest, Hollywood assistant Carmel Musgrove, who drowned after a long night of partying with cocaine, marijuana and alcohol.
RadarOnline.com previously reported that Aniston already has an "ironclad" prenup with Theroux in place. The Hollywood screenwriter "hated that he was marrying someone that had a massive fortune," a source told RadarOnline.com.
"The hope is that Justin won't fight the prenup, or drag this out," a source told RadarOnline.com. "Jen is going to get through this, she has basically been a single, independent woman for the last two years."