I normally work like a vampire. Around 8 to 9 P.M., what I call 'the spirits' actually show up, and then I just go in the booth and scream on top of a track. I only sing on the mic. I don't sit down and write anything.

I write by myself and then deliver the song. Everybody knows, 'Leave Ester alone when she's in her zone.' Give me a studio and the tracks, and I'll call you when the doctor is done.

I'm universal. As much as I can get out a 'Firework' with Katy, I can get a 'Lil Freak' out with Usher. Or a 'Lay It Down' with Lloyd. I can get Caribbean as I did on 'Rio,' then go from there to working with No Doubt.

I will make up a crush, you hear me?! I will look at a guy and say, for two months at least, 'I think you're cute.' And then I can be psycho. I will go in my head and make a whole life with him, he don't even understand why I'm mad at him. I'm like... 'cause you came in late last night!' And he's like, 'I don't even know you.'

I'm the only girl songwriter that fights for a lot of things. I fight for songwriting fees, which record labels want you to shut up about.

My method is, I just sit down and write a book.