The 27-year-old actress would love it if a director asked her to pile on the pounds for a role because it would mean she would be able to eat whatever she liked.
She said: "I`d love to get fat. I`d eat everything in sight! Matt Damon said for `The Informant` he was in heaven every day eating fried chicken and burgers and carbonara. That idea sounds very nice to me.
"It would be worth having to lose it afterwards for four months of eating like that."
The `Gnomeo and Juliet` star also believes there are double standards in Hollywood when it comes to the size and shape of leading stars.
She added to Britain`s OK! magazine: "I think actresses still think they have to be super-thin. There are actors who can turn up on the set 30lbs overweight and no one bats an eyelid.
"If a girl did that they`d tell you to get in the gym, so I don`t think it`s changed that much. Actors can get away with a lot more because they can cover it up more."