(Cover) - EN Showbiz - Katy Perry was inspired to write a song after running naked through a park.

The 26-year-old American pop stars third studio album Teenage Dream has received rave reviews from critics and the star admits there are some interesting stories behind some of the records most popular songs.

The party-loving star decided to write the track Last Friday Night (T.G.I.F.), after enjoying a debauched night out with pals in California, which involved Katy showing off her curvaceous body. She joked that the raunchy threesome mentioned in the song didnt actually occur though.

Theres nothing better than an impromptu dance party with my friends. My track Last Friday Night (T.G.I.F.) is a song about debauchery because I had one of those nights in Santa Barbara. We went out to this place called Wildcat and got crazy, she revealed.

We had a couple of beers and danced until we died, then brought the party back to the hotel room. Most of that song is actual truth, apart from the mnage trois... unfortunately! But, yes, streaking in the park, thats what we did, so we had to write a song about it the next day!

Katy also discussed the song E.T., which features vocals by rapper Kanye West. The track has a science-fiction theme, and Katy admits outer space fascinates her.

E.T. is a metaphor about finding someone who is just obviously not from this world because how could they love me like this? Even though its a metaphor, Im very interested in all things futuristic. I mean, I complain every day that the Hoverport has still not been invented! she laughed to Company magazine.

I think its absolutely ridiculous. I look out into the sky and to the stars and I feel there is so much out there. (C) Cover Media