Bikini-Clad Courteney Cox Vacations With Sexy Costar Josh Hopkins

She sure keeps 'em guessing!

Less than week after Courteney Cox seemed to be on the brink of a reconciliation with estranged husband David Arquette, she hit the beach with another guy entirely: Josh Hopkins, her costar and onscreen love interest in Cougar Town.

PHOTOS: Other amazing star bikini bodies

On Tuesday, Cox, 46, showed off her impressive bikini bod at the beach on the tiny Caribbean island of St. Barth's with a shirtless and toned Hopkins, 40, at her side. Also on hand for the tropical getaway: Coco, Cox's 6-year-old daughter with Arquette, 39.

With shooting on their hit ABC sitcom reportedly wrapped for the season, this particular getaway was a bonafide vacation for the costars.

PHOTOS: Courteney and David's romance

But don't get the wrong idea. "They are strictly, strictly platonic," a source says of Hopkins and Cox, who has also been photographed palling around with another Cougar Town costar, Brian van Holt.

And it's not just Cox, Hopkins and Coco enjoying the sun in St. Barth's, either. "It's a group vacation," the source explains. "She's close to her co-stars. She's been like that since Friends. But there's nothing more going on."

(Speaking of Friends: Hopkins casually dated Cox's most famous BFF, Jennifer Aniston, for a few months in 2010, before the duo cooled off in September.)

PHOTOS: Jen and Courteney's enduring friendship

Despite their trial separation last September, Cox and Arquette seemed to be warming up to one another at a March 23 press junket for Scream 4. "Oh my God, I'm so proud of him," Cox effused to Extra about Arquette, who's on the mend after a rehab stint. "Best he's ever looked. He's so cute!"

An observer even witness the estranged spouses holding hands following the junket.

Is a reconciliation imminent? "They are still figuring it out," the insider cautions. "Friends are hopeful but nothing has been decided."