The 41-year-old actress said she and Pitt, 52, couldn't stop laughing during the filming one of the steamy scenes as it was weird to have every step planned, reported Female First.
"We rehearse and had a very determined choreography, and then it allows you freedom. When you know exactly what your body will do, then you can act and you can be free to give the emotions and give the feelings because you won't think, 'What am I going to do next? Am I going to go on top of him?' It's an awkward situation.
The actress also taught Pitt how to speak French for the role.