One of the directors of the film, Daniel Kwan, told Entertainment Weekly that Jamie was not wearing a prosthetic stomach for the role.

He said: “Everyone assumes that her belly in the movie is a prosthetic, but it’s actually her real belly. She was grateful that she was allowed to just let it out.”

Jamie has been in the Hollywood business since birth, being the child of Tony Curtis and Janet Leigh.

She is married to Christopher Guest with whom she adopted two children, Annie and Ruby.