Courteney Cox was finally out of her bikini and back on dry land on Tuesday -- and ready for some quality time with her estranged husband David Arquette.

"Disney World really is the most Magical Place on Earth," Arquette, 39, Tweeted beneath of photo of himself, Cox, 46, and their daughter Coco, 6, in front of Cinderella's Castle in Orlando, Fl.

Despite the happy family outing, Cox has another man in her life now, too: Josh Hopkins, her Cougar Town costar. Along with little Coco, Cox and Hopkins, 40, recently wrapped up a luxurious island vacation in St. Bart's, where they were frequently photographed frolicking in the surf.

Although Cox's rep told Us the duo are "strictly platonic," observers in St. Bart's (where the trio plus some other pals stayed at the $12,800-a-night Hotel Isle de France) saw a much different picture. On April 1, Cox and Hopkins were spotted secretly embracing, an onlooker says in the new Us Weekly.

"They were cuddling on a lounge chair," the observer says. "They are trying their best to hide it. But they're a couple, and a beautiful beach in St. Bart's tends to make people put their guard down."

Adds a source of Cox, who announced her trial separation from Arquette last September: "Courteney is enjoying being single and dating."

For much more on Cox and Hopkins' sexy secret fling, pick up the new Us Weekly, out Wednesday.