In the next few years I'd love to play a female version of Doctor Who. I know exactly how I would play her - she would be crafty in a clever kind of way.

There's not enough money in the world to get me singing 'Because We Want To' again. I wouldn't do it. I think Beyonce Knowles got a couple of million for a private show but I would be happy to turn it down.

I was very similar at 19. I wanted something to happen in life, I wanted a bit more. I wanted to find someone who could challenge my ideas. So I definitely tapped into that.

I now know how to walk around properly in my undies. People would keep telling me to push my tits out! I also now know how to use a whip on people without causing bruising.

I think it must be hard being David [Tennant]. I get a certain level of attention but - I've seen it in action - he can't move for attention.

No one had much faith in me because I was so young. They imagined a little brat with a flash-in-the-pan single. It was inevitable... Thankfully, I proved people wrong.

I was freakishly ambitious. I didn't want to be a child. I wanted my own flat, to work and be a grown up.