When you idolise someone, or you hold someone in such high regard, you just want them to be everything that you think there are - and when they are it's just lovely.

It doesn't matter what you feel - ultimately, it's what the audience feels. You can finish a scene and think to yourself, 'Oh, God. I was so deep in that moment,' and find it just didn't play. I don't know if I have very good radar about that or not.

I've always been quite careful about what I wanted to do. I've just never wanted to revisit old ground or do something that's easy. I want to do something that I would look at and go, "I don't know what to do!" The most exciting thing is when you're a bit scared, so I'm looking to find something that's really terrifying.

When you do bigger jobs there's more attention and when you film in New York you get loads of paparazzi everywhere. It affects your work because you're trying to think about the person you're acting with and you've got 20 other lenses taking pictures of you at the same time, and it throws you.

I did The Seagull, the Chekhov play, on Broadway, a couple of years ago, and I had done it in London, and I became completely obsessed with the character, Nina, that I played in that. She's an actress. I couldn't find a play after that, that I wanted to do, because I couldn't think of doing anything else. Every part is a disappointment, once you've done that part.

I've never been obsessed with celebrity or star-struck or anything. I met Penelope Cruz when we were in Toronto, who I think is a goddess and an unbelievable actress, and she introduced herself. As she walked away from the table I had to take a deep breath, which was strange because I've never had that with anyone.

Remakes are a difficult thing 'cause some people feel very protective of the original.