Britney Spears and Katy Perry just met for the first time last week and Katy admitted it was an emotional moment.
She Tweeted: "OMG!!!!! I CAN'T IM CRYING."
Katy and Britney bumped into each other at the premiere of "Smurfs 2″ in Los Angeles.
Britney sings the film's theme song "Ooh La La!" and it turns out Katy also sings on the song, which was written by her pal and collaborator Bonnie McKee.
Katy said: "Me and Bonnie secretly did some background vocals on that song. So maybe listen for our voices."
After the two met, Britney Spears also Tweeted about the meeting.
She wrote: "So great to see you Smurfette Katy Perry! Can't wait for our Vegas date."
No details on what the "Vegas date" means, but rumor has it there could be a collaboration in store!