Katy Perry releases her highly anticipated single 'Dark Horse' featuring Memphis rapper Juicy J. The track will be found on her 4th studio album 'Prism' releasing next month. Produced by Dr. Luke and Max Martin.

"So you wanna play with magic, boy you should know what your falling for" melodizes Katy Perry. Juicy J and Katy isn't a collaboration you would expect but the two make it work here. "...She's very professional, everything went smooth and she's a great person," Juicy told MTV about their studio session.

Arriving on October 22nd via Capital Records, Katy Perry's 'Prism' album will include her Billboard Hot 100 chart topper 'Roar'. Other tracks rumored to be on the project include 'Legendary Lovers', 'This Is How We Do', 'Ghost', and 'Double Rainbow'. Pre-order 'Prism' now on iTunes and take a listen to 'Dark Horse' below.