If you can take it to the next level and really tell an interesting story in a unique and fresh way, then I feel like that's a great song.

I've been close friends with Katy since teenagers, before she was Katy Perry. She's always been a great resource for me to pull from and watch - from her choice of how public she wants to be about her personal life on down. I also watched her develop from the coffee-house singer-songwriter I knew to her be to playing arenas and killing it.

I am a little crazy but when I'm on-stage, then I really get to play it up and perform and be over the top and it's like an outlet. It's fun to 'wild' out.

In real life I'm pretty easy going and pretty chill, I'm not the party girl who will go wild and crazy necessarily.

I had an epiphany where I realised that there are song titles everywhere - in advertising, in conversations with people at the grocery store - and every time I open my mind to that and find titles, I then weave a story around that.

I think the difference between a good song and a great song is... honestly, I think the lyrics, because if you have a really solid melody and solid track and everything is there but then the lyric is just okay, then you've got a good song.

No matter what, I always have expensive designer shoes. It's all about the shoes for me.