The Dark Tide costars were snapped walking together, holding hands and talking over coffee in London on Thursday.
Earlier this week, the couple, both 44, were spotted strolling arm-in-arm and kissing in his hometown of Paris.
"It was the classic 'I'm going to kiss you here in a dark corner' move," an onlooker tells PEOPLE of Berry and Martinez's romantic romp. "And she was waiting to be kissed."
For more on the cozy costars weekend in Paris, pick up the new issue of PEOPLE, on newsstands now