Teenage Dream' was the hardest breakup for me.

One thing I'd tell an up-and-coming singer is to never rely on other people for anything. The more self-sufficient you can be, the better off you'll be.

There's a lot of little 'Bonnie-isms' in 'Teenage Dream' that I was hoping to keep for myself.

In my mind, I imagined L.A. to be skyscrapers on the beach. Of course, that's not what it actually looks like. And growing up watching 'Beverly Hills 90210' and 'Melrose Place,' I always had an obsession with L.A. and California in general.

I try to remind myself not to go anywhere or do anything without asking for spiritual direction through prayer and meditation.

I sympathize with the zombies and am not even sure they are villains. To me they are this earth-changing thing. God or the devil changed the rules, and dead people are not staying dead.

We live in a world now where everything is tweeted and Instagrammed and tagged and now, God help us, Vined. Calling out grievances over Twitter has become an industry norm.

We need to have a modicum of faith in people's common sense, creativity and will to survive and prosper even in the face of great difficulties and obstacles. If people could keep society running in the aftermath of the Black Death, they could keep it running after the U.S. government defaulted on its debt.