'Die Young' hitmaker Ke$ha has revealed that she had such a fantastic time celebrating her birthday back in March that she got a permanent reminder of the night inked onto her foot.

In the new issue of Vibe magazine, on which the songstress also graces the cover, she explained that the party she threw to mark turning 25 was a one-of-a-kind affair and she invited a tattoo artist along for her guests' enjoyment, but ended up getting a tattoo herself:

"I had a birthday party downtown with a tattoo artist, free booze, and a photo booth. And it was the funnest party ever. Everyone I love was there. I ended the night jumping on a mini-trampoline. So I got the tattoo artist like, 'I need you to commemorate this night with the word fun on my feet.' He was like, 'Really?' And I was like, 'Yeah. Do it.'"

Ke$ha also talked about how she is pigeon-holed in the music industry and admitted that she finds it strange to be classified as a rap artist: "The first time someone called me a rapper, I started laughing. I was shocked, and thought it was hilarious. But then, Andre 3000 was telling me how he thinks I’m a good rapper. And Wiz, who’s a good friend of mine, thinks I’m a good rapper? Snoop? It’s crazy and funny to me.”

She also talked about the reception of her music on a commercial scale and expressed a sadness at how a lot of people wrote her off after the release of her debut record, but said that her only intention is to make people happy and get them dancing:

"I’ve really just been doing a lot of thinking about life. The first record, people tore me a new a**hole, and were f**king steady on my balls, and tried to make me feel like I was such a piece of sh*t. I did some soul-searching, and realized nothing I’m doing is negative, it’s actually super positive."

"You can change peoples’ mood in a three-and-a-half minute song. So why not spread positive energy and be funny? Let [the haters] be miserable. Anyone who wants to have a good time, let’s f**king do this.”