We've heard plenty of stories from Hollywood's biggest stars saying that there isn't anything romantic or steamy about filming love scenes—there's a director barking orders through a megaphone, a few dozen union workers are there taking in all the sights. It's stressful.
"It's awkward! It's always awkward," she told our own Ben Lyons during a recent interview. "It's just weird to kiss someone that you wouldn't choose to kiss in your personal life."
But being the pro, and Golden Globe winner she is, she buckled down and made it happen. "You get over it," she said. "You laugh through it and act like an immature kindergartner, which is what I did much of the time."
Kutcher, on the other hand, had no problem: "When the script [for No Strings Attached] came along, she was already attached to it," he said. "I was like, 'Cool! Now I get to go toe-to-toe with Natalie Portman!' For me that was the challenge I wanted to take on."
Check out the video to hear more from the two stars, like what kind of movies Portman likes to see and what Ashton thinks is the key to a successful relationship.