She have said that she used to want plastic surgery: “I wanted a nose job, but now, my nose is what lets me change my face a lot - and I can be glamorous as Agent 99 [in Get Smart], then look rough as a drug addict for (director) Jonathan Demme [in upcoming Rachel Getting Married]... Your face needs to have character if you’re an actor - otherwise you’re just a face...”
We don't think that she got anything done, her body and face don't have any important change like to be product of plastic surgery. Her lips are full, sometimes they look fuller but it can be result of the make up that she is wearing in those occasions.
About her breast, we don't think that she got implants either because we don't see any of the classical signs for breast augmentation. She is still so young though, so who knows if she get something done in the future.
