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Mila Kunis, Ashton Kutcher, Princess Beatrice

Spread/X17online.com

As if we needed another reason to be jealous of Ashton Kutcher and Mila Kunis.

The gorgeous couple stepped out Saturday in St.Tropez, where they were snapped strolling barefoot on the beach with their favorite couple: Princess Beatrice and her beau Dave Clark.

The friendly foursome seemed in good spirits as they enjoyed the sunny weather, looking relaxed and content as they spent the afternoon together.

Mila Kunis, Ashton Kutcher, Dave Clark

Spread/X17online.com

Kunis looked casual and cute in jeans and a giraffe-print sweater, sporting chic aviator shades with her hair swept up in a ponytail. Her man rocked his best resort style, looking fine and fashionable in a navy jacket, wide-brim fedora and a salmon-colored button down shirt.

This is hardly the first time Mila and Ashton have been snapped with Beatrice and her beau. They went on a double date with the couple last month in London, and they were spotted giving Clark a tour of the London neighborhood of Hampstead just last week.

Watch out, Jay-Z, Beyoncé, Gwyneth Paltrow and Chris Martin! These four are quickly becoming the coolest celeb double daters.