The acclaimed director wants Kristen to look “dowdy and puffy” for the film, in which she plays an assistant and confidante to Juliette Binoche, a source said.
Olivier has put Kristen on a daily diet of more calories than usual to make sure that she achieves the figure that he wants.
Kristen has been munching on chocolate squares throughout the day in between takes in a bid to gain the weight.
Kristen recently spoke to WWD about her new role.
“I play a personal assistant to an actress,” she said said.
“It takes two very particular people to have that relationship be functional – one that services the other – because Juliette Binoche is playing the actress that I assist, and she is one of the most powerful women I think I’ve ever seen in film.”