It was a complete dream to work with David LaChapelle. I collected his books as a teenager, and I fantasised that he would direct the video for 'Spectrum' from the moment the song was written. I still can't believe it actually happened, 
and I'm completely overjoyed that he felt such a connection with the song.

I get in fights with my sister all the time. She comes on the road with me and we fight - like sisters do.

At the beginning of my career I was going through a really weird phase of dressing in boys clothes. I would only wear one American Apparel T-shirt and shorts and brogues the whole year round. Not the same T-shirt, obviously, but one style of American Apparel T-shirt. I think I was going through a tomboy stage.

The release of 'Lungs' was so hard. It was terrifying, because it was the first time doing everything. The first experiences of media exposure were almost paralysing. I spent a lot of time crying on the floor of the studio - it sent me a bit mad.

I love that sense of release as you throw yourself into the crowd as hundreds of arms are carrying you.

I love Lady Gaga and I love Katy Perry and R&B and rap music... I love big, American pop music.

The stage is a place where I can be wholly myself. Even though you're in front of people almost to be judged, it is a place without judgement.