Never say never - and I certainly don't judge anyone who does it. But most of the characters I play are going through some kind of emotional turmoil, so my job requires me to have expression. If my face was froze, what right do I have to play that part? All the women who haven't done anything to their faces are still able to play great roles. And some of the ones who have done something have messed it up - they look freakish. Anyway, for me it's about playing women with rich lives - and the longer the life, the deeper the wrinkles.

You're always nervous about how a film lands with an audience.

When I had dark hair I definitely felt that I was more anonymous.

I go to a dance class myself called BBS - Body By Simone - its little mini dance routines and I am often the oldest person in the room although I forget that. I'm fairly fit.

It is a huge amount of pressure playing someone like Valerie Plame-Wilson. First of all who she is and what she's done is wildly intimidating and impressive. It is just scary to take on that responsibility, and you want to honor her story, an incredible story that affected us all. She is often doing things that were confusing to me, like her sexual prowess. I think that she is in a lot of pain and she has been really badly wounded along the way. She doesn't hold men in the highest regard... not just men but people.

I don't know that any woman could ever not think about that at some point - even making the choice not to do it and getting to the place of peace of choosing not to be a parent, there would have still been some struggle in between. I'm not a man but I don't think it would occupy their minds as much.

I think film is a director's medium and the good filmmakers that I like tell the darker stories. Therefore, I'm always inclined to follow people like David Cronenberg.