Ashton Kutcher and Mila Kunis, Princess Beatrice
Courtesy Wilmer Valderrama; Mark Cuthbert/ABACA
05/14/2013 at 10:00 AM EDT
Over the weekend, Mila Kunis
, Ashton Kutcher
and Princess Beatrice
proved that Hollywood and royalty can be a perfect mix.
The former That '70s Show
costars toured a string of bars with the young royal and her boyfriend, Dave Clark, in London on Saturday.
The foursome visited the Calloh Callay bar in the trendy Shoreditch neighborhood, where a source told PEOPLE, "They sat in our upstairs Mexican bar on barstools. They drank Jose Cuervo shots and cocktails."
The source adds, "[They] were lovely customers, friendly and not at all demanding."
A weekend in London is nothing out of the ordinary for Kunis and Kutcher, who have been traveling the world together. Just last week, the couple visited a winery in Spain
and prior to that, they toured Bruges, Belgium
– Phil Boucher