According to the 30-year-old actress' co-star, ten-year-old Isabelle Allen, who plays her daughter Cosette, Hathaway lived on "rabbit food" during the shoot and she was so thin during the filming of the movie that she broke her arm while she was riding a bike, reported Daily Mail online.
The young British actress had lunch with Hathaway in New York after the film's premiere last year and she was apparently craving the chips that Isabelle was eating.
"'She said this is real food'. Well it was because obviously she had been eating I call it rabbit food, because she was only eating salad and greens and vegetables because of her diet, because of her character," Isabelle said.
"She (Hathaway) had broken her arm because she was so thin and fragile. She was riding a bike and she broke her arm," she added.