Katy Perry hair heels autograph striped dress tight dress

On Monday evening Katy Perry made an appearance on Jimmy Kimmel Live, and the green-haired songbird spent quite a bit of time with her fans before the show. We love that she's always such a sweetheart when it comes to signing autographs and posing for photos!

In other news, Katy recently chatted with CMT's Crossroads and revealed that her upcoming music video for "Birthday" will be unlike anything we've ever seen. I wish I could say its sexy, but its not, she said with a laugh. Its me at my most insane."

Guess we'll find out what she's talking about when the vid debuts later this week!