You're starring in the slapstick comedy Johnny English Reborn, which seems an unusual choice for you. Was that part of the appeal?
I generally like to make choices based on who I'd like to work with - and I liked the idea of playing the MI7 [spy agency] role with Rowan Atkinson. I think the thing that surprised me the most was how technical it was . . . I was aware of how I needed to work my technical muscle in a way that I hadn't before.
Is the atmosphere on the set of a comedy film different from that on, say, a period drama?
There's a heightened sense of comedy around and there's a bit more laughter. On the other hand, it seems to be more serious, because it's quite serious business, comedy.
Is there snobbery about doing a broad comedy?
Very early on, when I signed on to this project, I had read on IMDb [that] somebody was commenting on why I would choose to be in this film. And I thought, hang on a second - if I was doing a Jim Carrey film, nobody would be having that reaction.
It worries me that you are reading IMDb comments. Do you google yourself a lot?
No! I was looking up something else.
Some people do.
Ha, the first thing I do when I get up every single morning, after I feed the kids, is I go and google "Gillian Anderson".
Are your children affected by your fame?
No, the very, very first situation that we had was when we went to see Cars, and at the movie theatre we were handed a popcorn box with my picture from Johnny English Reborn facing me. My almost-five-year-old said: "Mummy, that's you!" really loudly and proceeded to turn the box around to find out where Daddy was.
It was very funny, but that was the first time that any kind of explanation was needed. And
I can't even remember what we said to him at the time - we sort of tried to push it under the table. It's too early for him.
If any of your children wanted to act, what would you say?
Well, I have a 17-year-old, and that would be the one to come to me soonest. Fortunately she is not interested. I have to say I'm a bit relieved she doesn't want to be an actor.
Because of the lifestyle or the insecurity?
Yes, because the statistics show, I think, that only 5 per cent of actors are working at any one time. My father gave me a lecture at one point when I was younger and told me that I shouldn't be an actress because I should probably get a real job, and that I should go into - what was it back then; computers were really young? - it was word processing.
You've done several period dramas. Are the roles available better?
It's a joy to do that kind of stuff. Every time somebody comes to me and says do Dickens, do Ibsen or Chekov or whatever, it's an honour. If there were two roles sitting in front of me and one of them was Ibsen and one of them a modern piece, I'd probably choose Ibsen. The other side of that is, yes, there is a shortage of good material for women that is as provocative and complex as some of the writing in the classics. But I don't feel like I'm choosing those [the classics] because there's nothing else out there. I am choosing those because I want to do them.
You were in A Doll's House at the Donmar Warehouse in London. What is it like to act in such an intimate theatre?
Each theatre has its own, very strong personality. There's something quite arresting about being in a space that small. The closeness of the audience lifts you in a very different way.
Why do you like Ibsen?
Ever since I don't know for how long, people have come to me and said, "You have to do Hedda Gabler; that's a role that's made for you." I'm not sure how much of an insult that is.
In March, you chose Barack Obama as the person you "most admire". Is that still true?
Well, I don't know about most admire. I still think he is a person I admire, but it has been a horrible ride for him since he came into office. And I just cannot imagine waking up every single day and having that burden on your shoulders and not just wanting to crawl under the covers and say, "I'm done." I still hold him in high esteem; he is doing his utmost for everybody. I am amazed what he still handles and the grace he continues to operate under.
Do you vote?
Yes, but in the States. Very enthusiastically for Obama coming into office, and this time round it will be Obama again, no matter who comes up on the Republican side.
Was there a plan for your career?
No, I've gotten lucky.
Are we all doomed?
No, not at all. Only some of you.
1968 Born in Chicago. Grows up in London and Grand Rapids, Michigan
1993 Lands star role in the X Files TV series
1994 Marries her first husband, Clyde Klotz, and gives birth to her daughter, Piper
1997 Wins an Emmy, Golden Globe and Screen Actors Guild Award for The X Files
2005 Stars in the BBC's Bleak House
2006 Gives birth to her son Oscar
2008 Her second son, Felix, is born
2010 Is nominated for an Olivier Award for her role in A Doll's House at the Donmar
Johnny English Reborn is in cinemas now.