Katy Perry And Sia Go Cross-Eyed In The Studio, AKA Katy's Still The Funny Face Queen (PHOTO)

Katy Perry and Sia go cross-eyed from their Red Bull buzz. OMG! Not only are we flipping our ish over the fact that Katy Perry IS BACK IN THE RECORDING STUDIO (!!!), but she's back in the recording studio with Sia (you know, the singer-songwriter who wrote Rihanna's "Diamonds" AND collaborated with David Guetta, Christina