Jessica Chastain and James McAvoy both star alongside each other in the forthcoming drama 'The Disappearance of Eleanor Rigby,' but just because the film's story is a very serious doesn't mean filming it has to be.

Jessica Chastain
Chastain opened about working alongside McAvoy

The 37 year-old actress recently opened up in the October issue of Interview magazine about working alongside McAvoy and recalls how the Scottish actor kept making her laugh while shooting intense scenes in the flick.

More: First Look At New Movie 'The Disappearance Of Eleanor Rigby' [Trailer]

"I actually had difficulty keeping a straight face on 'The Disappearance of Eleanor Rigby,' especially because James McAvoy is super, super funny, and he improvs a lot," she told the mag. "There's a lot of me breaking, but doing it in character that actually made it into the film."

However, Chastain wasn't against McAvoy constantly making her laugh, even if his antics disrupted the scene, as she prefers to joke around.

More: Jessica Chastain Begins Feeling "Depressed" When In-Between Film Projects

"With any kind of acting, you're basically living the emotion that you're going to work in every day," she explained. "So sometimes I'm like, 'I am so tired of crying, how great would it be to experience joy and laughter every day?'"

Jessica Chastain
Chastain and McAvoy in 'The Disappearance of Eleanor Rigby'

"There's a scene where we're kissing in the car and he's putting my bra on me. He says something like, 'I think I've been programmed to not be able to do this'. And he starts going off about how he only knows how to take off a bra," she recalled. "I looked at him, like, 'You're so stupid', and started laughing. That's in the film. James has so much lightness and love around him that, even when we were working on the difficult, sad scenes, between takes we had a feeling of celebrating life."

'The Disappearance of Eleanor Rigby,' which is told from three different perspectives Him, Her and Them, is already expected to be a front-runner at next year's Academy Awards.