The A-list couple, usually the center of attention all by themselves, had dinner early Saturday evening with Princess Beatrice and her beau Dave Clark at the Duck & Waffle restaurant—which, by its location on the 40th floor of London's Heron Tower, literally makes it the highest restaurant in the U.K.
Ashton and Mila, who spent the prior weekend on holiday in Spain, were wearing matching Real Madrid T-shirts.
A rep for the restaurant tells E! News that the merry foursome told the staff that they were on a charity food crawl before indulging in their titular house special, consisting of two waffles, crisp-skinned duck confit, a fried duck egg and spiced maple syrup.
"They were very nice, even stopping by and chatting with the chef on the way out," the rep says.
And the fun didn't stop at supper. A source tells us that the couples' night also included a round of "the four best cocktails" at a bar in Islington and then a visit to the celeb-friendly Callooh Callay in Shoreditch.
"Thanks for visiting us tonight Ashton Kutcher & Mila Kunis! We hope you enjoyed the Jose Cuervo tequila cocktails @aplusk," read a May 11 post from the bar's Twitter account.
On Sunday, Callooh Callay tweeted: "Did you know that we've had quite a few celebs in our bar? Princess Beatrice, Mila Kunis, Ashton Kutcher, Emma Watson, [Keira Knightley]...We forgot to mention, Princess Beatrice was also in the cantina last night. We've officially hosted royalty. Better yet, we gave her Tequila."
Oh, and get ye to the bar, because, "The Jose Cuervo pop up is only open for one more week so book now!" read another tweet. You can sit on Beatrice, Ashton & Mila's stools and lick their glasses."