AOL: Let's talk about 'So What.' It's turning into the biggest song of your career. Why do you think so many people are responding to it in such an incredibly positive way?
P: I have no idea why anyone gets 'So What.' That song was a joke when I wrote it. I was like, "Oh, this will be funny: 'I guess I just lost my husband, I don't know where he went.'" That's funny right, and then it just kept going on from there, and every line was funnier than the last. Although, everyone thinks I'm trashing Jessica Simpson, but I'm actually not at all. I'm actually saying that she's cooler than me 'cause the waiter keeps taking my table and giving it to her. It was a syllable thing with that -- Jessica Simp: "The waiter just took my table and gave it to Jessica Simp." It would have been that or "the pilot just took my private jet and gave it to Haley Duff," but that wasn't as cool, so it ended up being Jessica Simpson. It's also funny of how much pain I had to go through to write that song and now it's the biggest song of my career.
AOL: You've been doing this for almost 10 years now, so what is the biggest thing that you've learned?
P: I signed my record deal when I was 16. I just turned 29. I've learned so much. At first, I wanted to write a book called 'Artist to Artist: How to Get Fucked 101,' because I felt like I could fill every chapter, and now it's less of like an angry thing. It's more like a sitting back and knowing which way to go. I know I have to be healthy on tour. I know that I have to write the kind of songs that I'm gonna live with for the next two years. I know I have to work with people that are creative and safe, as opposed to one-hit wonders or people on top of the charts. I know that it's more fulfilling to do what moves you than to try and get a song on the radio. I know more about myself. It's completely night and day, and I'm grateful for every lesson. I'm fearless when it comes to that stuff.