PICS: Josh Hopkins Plays With Courteney Cox, Coco in Surf

 Splash News Online

The fun never stops!

Courteney Cox and daughter Coco, 6, continued their sunny vacation in St. Barth's over the weekend — with Cox's sexy costar Josh Hopkins as their constant companion.

In new pics taken Sunday, Cox, 46, and Hopkins, 40, frolicked in the water with Coco, Cox's little girl with estranged hubby David Arquette. Hopkins (who briefly dated Arquette's BFF Jennifer Aniston last year) looked completely at ease with both Cox and little Coco — even hoisting her up for a handstand!

"They are strictly, strictly platonic," Cox's rep tells of the actress and her castmate, adding that the St. Barth's jaunt is "a group vacation."

Still, even Hopkins' father, U.S. Congressman Larry Hopkins, isn't 100 percent sure what's going on.

"I know he likes her and is very fond of her," the elder Hopkins said last week. "He said she's a very nice person…If he approves of her, then I approve of her."

Before heading off for her island getaway, Cox was all smiles promoting Scream 4 with Arquette, 39, from whom she separated last September.

 "Best he's ever looked!" she gushed of Arquette, who left rehab in January. "He's so cute that I'm like, dude, I don't understand. Really?! Why are you that cute right now?"

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