Selena Gomez’s Halloween Costume: Katy Perry!

What has blue hair and an ice cream bikini? Selena Gomez on Halloween.

In a live chat with, the Disney star said, “I’m going to be Katy Perry for Halloween. It’s the ‘California Gurls’ [music video] outfit with the blue hair. I’m so excited.”

The newly-18 and upcoming pop star confessed that she’s played some trick of her own, claiming she TP-ed someone’s house who wasn’t nice to her.

Watch out, everyone. If you mess with the The Wizards of Waverly Place star, she might just pull something out of her sleeve when you’re not looking.