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.

I would really love to do a musical, I don't know in what capacity but something funny.

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.

A musical film is my idea of heaven. You can pre-record, you don't have to sing live. Singing live was the bit I hated the most. I never felt like a confident singer.

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.

Rose and I have gone on the most incredible journey over the past two years

The whole size zero debate is disgusting. My sister, who's 13, looks amazing - but she's already worried about her figure.