I got approached by SoBe a few months ago about being an ambassador and I learned about the previous ones including Naomi Campbell, so I was instantly interested! Then I tried and really liked it. It's different and has interesting flavours... we don't have anything like it in the U.K.

I got a random tattoo the other day. It's a red triangle, which makes everyone think I'm arty, which I'm not. I used to draw red triangles all the time. It must mean something - maybe I don't know it yet. But I'll figure it out.

Even when I'm in quite a happy state of mind, I like writing really sad songs. I think a lot of people do.

If a hundred people want autographs, sometimes you have to say no because you've got to get up for a 4 A.M. flight or something. In that sense, it really pisses me off when people think you've become a diva. It's not becoming a diva, it's because of the situation, I think.

My guiltiest pleasure is... chocolates with strawberry cream and trashy television - 'Geordie Shore,' 'Katie,' etc.

I met Prince William at a musical festival and he let me know he was a fan of my music. But the invitation to sing at his wedding reception came completely out of the blue. The fact that Kate and William knew the words to my songs was very touching.

I was super brainy and a proper geek at school, but there would always be a boy. But that sort of obsession did turn me into a songwriter. My writing has always come from that feeling of infatuation.