The pair are starring opposite each other in the upcoming science fiction romance film ‘Passengers’, which marked the first time that she’d ever had to do an intimate scene.
Speaking to The Hollywood Reporter, Jennifer revealed that she felt so nervous about the scene that she had a drink before hand - something which proved to be a bad idea.
“And I knew it was my job, but I couldn't tell my stomach that. So I called my mom, and I was like, ‘Will you just tell me it's OK?’ It was just very vulnerable.
“And you don't know what's too much. You want to do it real, you want everything to be real, but then … That was the most vulnerable I've ever been.”
However, Jennifer previously admitted she found kissing Chris easier than locking lips with her ‘Hunger Games’ co-stars Liam Hemsworth and Josh Hutcherson.
Talking about Chris, she told Cinema Blend: “I don’t know him as well as I know Josh and Liam… It doesn’t feel as much like making out with a family member.
“Not that I’m against that - I’m from Kentucky,” she joked.
‘Passengers’ is due for release in December 2016.