The 33-year-old actress plays the lead in upcoming biographical movie Christine, about news reporter Christine Chubbuck who committed suicide on live television during coverage of shootings in the 1970s. Rebecca had to get deep into the mindset of the troubled, depressed journalist and found herself scared while acting out the most crucial scene.

"Well, your body, when you’re acting anything, your brain knows that you’re doing something, but your body doesn’t," she explained to "When you’re holding a gun up to your head, your body thinks you’re holding a gun up to your head. Your adrenaline function thinks that you’re holding a gun up to your head. When you have fake blood pouring out of your head, your body thinks that.

"It was all practical and I couldn’t stop shaking for like 24 hours after. It was very, very disturbing. Nothing compared to what some people go through in real life..."

Luckily the tough scene was filmed on the last day of production and Rebecca had a great deal of support from fellow cast members and crew.

It was a difficult task trying to recreate Christine's final moments as the actress only watched 20 minutes of footage of her, but that only added to the challenge.

"Well, the reason that I love doing what I do is because I think it’s fundamentally creative," she explained. "Even the ones that don’t look like it’s a big ol’ characterisation, it’s still ultimately me because I’m making my own choices. And so, I’m obviously going to learn something about myself.

"But it’s the ones that I don’t really know how I’m going to do it and I don’t understand them, those are the ones that I love. And it’s always like that. I mean, they’re always characters and I’m always trying to create something."