But the X-Men: Days of Future Past costars did just that while casually strolling in London on Thursday.
Sure, holding hands isn't exactly sucking face, but the two definitely seemed to be enjoying each other's company as they made their way to an outdoor café for lunch.
Last month, Hoult couldn't help but gush about Lawrence in V Man's spring issue when asked how he is able to navigate through the media frenzy surrounding his girlfriend.
"The privacy thing obviously changes, but the rest pretty much stays the same," he said. "It's like that thing whereby you don't believe your own hype. Enjoy the good times, but don't get swept away with it. And I think that's something she's capable of doing and that's what makes her special, but yeah, it is very odd, and I am just kind of a bystander in many ways.
"It is well-deserved for her. I haven't really seen any change in her."