It must be casual Monday!

Katy Perry arrived at the recording studio today to work on her upcoming album, and the "Fireworks" singer dressed down in grey sweats, a white tank, and a head scarf. Maybe she had a sleepover at on-again boyfriend John Mayer's place the night before?

We can't wait for the new tunes!

The California girl recently told fans that her new songs are going to be a departure from her signature bubble gum pop sound!

"Maybe I'm not specific with names, but that's my lockbox where all my secrets go. Writing is like therapy. [My songs] stem from the truth inside of me. It will be a much darker album than the previous one. It was inevitable, after what I went through. If I had a time machine and could go back in time, I would. But I can't, so you'll discover another part of me," she told Press Party.

There's even rumors she recorded a track with Mr. Mayer that will be appear on his upcoming album!