Paul Bettany and Jennifer Connelly were "nervous" about making a movie together.
The married actors star as Charles Darwin and his wife Emma in 'Creation'
and say they were apprehensive about taking on the project in case it affected their home life.
Paul said: "We were both kind of nervous about it, it's hard to come home and slag off the leading actress when you've come home to the leading actress!"
Despite their fears, the couple were surprised at how easy they adapted to working together.
Paul added to Total Film magazine: "It ended up being such an easy working relationship. It was a very low-budget film with not much time to get things done. So as far as bringing our work home, we were just too exhausted."