The actors co-star in the upcoming Western thriller Brimstone, and new reports suggest the two have been spending a lot of time off camera as well.

In photos obtained by the U.K.'s Daily Mail, the Game of Thrones actress is seen propping her leg across Guy's lap as they wait for a vehicle at a car rental depot, while another shot shows the actor gently touching her thigh.

Earlier this month (Jan16), the two were spotted together in Van Houten's native Netherlands, and Dutch publication De Telegraaf suggests they have been a couple since November (15).

The news surfaces months after Guy confirmed he and his psychologist wife Kate Mestitz split after 18 years of marriage.