Katy and Selena Team Up!

Is Selena the next California Gurl?
With her album dropping this fall and a single coming out in less than a month, the singer — who just turned 18! — talked about collaborating with Katy Perry with HollywoodLife.com:
"Katy Perry gave me a song, and she did background vocals on it," she said. "The whole experience was really fun."
We bet! No word on what the song is yet, but knowing Katy, it'll be something absolutely insane! Hope Sel can fit into a cotton candy dress...