Theroux -- who called it quits with estranged wife Jennifer Aniston in February -- was all smiles as he and the 28-year-old Spider-Man: Homecoming star spent time hanging out together in the ocean on May 26.
The 46-year-old Leftovers star rocked a pair of blue-and-white swim trunks and a gold necklace while the gorgeous Harrier showed off her svelte physique in a vermillion one-piece bathing suit and a pair of round-rimmed shades.
The two spent much of their time lounging around on a floating dock in the middle of the ocean before showing off their daring side by leaping off a hanging rope ladder into the clear waters, as well as jumping off a diving board.
“Justin is not in a relationship,” a source tells ET. “He’s super social and loves meeting new people and collaborating on ideas with friends. These days he’s been spending time with friends and family – he’s super close with his brother."
While Harrier was recently in France for the Cannes Film Festival -- where she was promoting her upcoming film, BlacKkKlansman -- she and Theroux were both in the luxury vacation destination this weekend for the Louis Vuitton Cruise 2019 fashion show.
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Justin Theroux Breaks Social Media Silence Following Jennifer Aniston Split With Surprising Post
The star-studded runway show was held in the small hilltop village of Saint-Paul-de-Vence, and featured a score of big name guests, including Emma Stone, Ruth Negga and Jennifer Connelly, among many others. Theroux is currently one of the faces of Louis Vuitton's spring campaign.