Courteney Cox and her "platonic friend" Josh Hopkins can't keep their clothes on around each other!

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The two suffered His & Hers minor wardrobe malfunctions while vacationing together in St. Barth's yesterday -- losing control of their clothes in the surf!

While rumors of a romantic relationship have surrounded the duo since they were spotted holding hands on the set of "Cougar Town" after filming wrapped last month, Cox's rep says there's nothing juicy going on and "they are away with a group of friends on vacation."

Check out their beach bods above!

PS -- How amazing does 46-year-old Courteney's body look?!