Katy Perry Celebrates Her 29th Birthday in Lakewood, Colo.

The birthday girl talks about writing her new album, "Prism."
2:14 | 10/25/13

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Transcript for Katy Perry Celebrates Her 29th Birthday in Lakewood, Colo.
they do the count, you'll come out number one in probably the top-selling female ever with this, I believe. That number's not out yet. But I pray, sam. I believe it. How about that, ladies and gentlemen? I'll take it. I believe that's going to happen, following the trend right now. What's it like to -- should we go into -- what's it like to spend your birthday? I'm 29. And I feel great. A young birthday. With a few of your closest friends. I feel like I'm 13 sometimes. Honestly, you can tell by my music. And my spirit. It feels great because you know what? I'm so excited about this record. And I just love all the participation and the unification -- is that a word? That's a word. I need to go back to school, obviously. But the unification of all of you guys coming together and roaring in one shot. That was so cool. Yeah. Can I just say the -- can I say first of all, no one can jump rope like that and sing and do all that. How about a little hand for the jump roping live on stage and the singing. Katy, let me ask you something. They want to present you a jacket. Oh. Let's show you. How cute. The jacket they got for you. As we do that, I want to ask you something serious about this. I think this got a little more special and a little more deep than we anticipated. There were so many stories that came out. These kids bared their souls. I was truly touched. I cried. I was blown away by some of the creativity. There was so many different variations. And I appreciated all of them. There were a lot of finalists. And I really love that everybody could have that school spirit still. We live in a time where I think where we're really distracted and there's a lot of other things and situations that we could be somewhere else. On our phones or whatever. But everybody came together and made fantastic videos. Entries. School spirit still lives.

This transcript has been automatically generated and may not be 100% accurate.

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