Katy Perry Releases 'Dark Horse' Track Featuring Juicy J

Katy Perry has released "Dark Horse," the second single from her upcoming third studio album, Prism. The track, which features Juicy J, is not an official single but a fan chosen promotional track; it's available for download at iTunes now.

Fans who pre-order Prism-due October 28-will get "Dark Horse" as a free download.

"Roar," meanwhile, is still tearing up the charts, one week after knocking Robin Thicke's "Blurred Lines" from the top of the Hot 100.

The video for the cut, which hit earlier this month, features Perry donning a sexy leopard print top while swinging through trees on a vine.

Perry will take the stage on Saturday Night Live as the musical guest on October 12. She hosted the show in 2011 and acted as the musical guest the year before that.

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