A friend of Kidmans is quoted as saying: Its a very demanding role because there are a lot of explicit lovemaking scenes. The film is set over several decades so her character changes a lot. Nicole was originally planning to use prosthetics but was told by the director, Stephen Daldry, it would be more realistic if she gained the weight.
Its not usual to see her work her way through a big plate of pasta, with bread, and then a dessert.
Kidman, who plays a Nazi camp guard who has an affair with a teenage boy and is later put on trial for war crimes - has reportedly enjoyed one major benefit from her weight gain - bigger boobs!
Kidmans friend added: Nicole loves her new bosom, but she is finding eating so much makes her lethargic and sleepy.

Nicole Kidman recently appeared at the New York film festival with such flawless skin that one newspaper described her as a “living doll”.
According to the Mail on Sunday, the 40-year-old Kidman is the “ultimate porcelain princess”.

Nicole Kidman and Keith Urban home is for sale, $2.5 million is the price.
Nicole Kidman and Keith Urban are movin out. The couple have put their four-bedroom, five-bath home - which includes a gym, pool and spa - in a ritzy section of Nashville up for sale. The listing price of the 7,000-square-foot manse, inside a gated community, is $2.5 million.
One pal said, “It was Keiths house - they probably just want to find a home that is theirs.” A rep for the ghostly-pale actress didnt return calls.