Juicy J Talks 'Dark Horse' Collaboration and Video, Potential New Album

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Juicy J performs onstage during the 56th GRAMMY Awards at Staples Center on January 26, 2014 in Los Angeles, California.

Juicy J could be hitting No. 1 in the country due to his guest spot on Katy Perry's "Dark Horse," and the rapper is still shocked he was even featured on the song.

"The producer, Dr. Luke, called me up and was like, 'Yo, Katy Perry wants to feature you on a song.' I was like, 'Are you serious?'" the Academy Award-winning artist told Billboard on the red carpet at Sunday's GRAMMYs. But once he got over the initial excitement of getting asked to appear on a Perry tune, the rest, he said, was "history" -- that is, after an impromptu studio visit following the initial recording of his verse.

"I did my verse in the studio, and then [Dr. Luke] called me said, 'Hey man, she wants you to change up a couple bars, so she wants to meet you in the studio,'" he explained. "So I jumped in my car, drove fast as I could to get to the studio. I got to the studio before she came. I fixed up all the bars, she came in, [and] she loved it. The rest is history. She's super professional. She's a genius."

A music video for "Dark Horse" is soon to follow, and though Juicy J can't reveal details about the clip just yet, he's definitely singing its praises from the start. "It's a movie, man. It's a major motion picture," he said. "I can't really tell you because it's definitely going to be a surprise, but I'll tell you this much right here: you've seen her other videos, this one's gonna be just as big. Everything she does is like grade A."

Katy Perry, Juicy J Ride Into the GRAMMYs With 'Dark Horse'

The rapper also revealed another big detail in his own life: in addition to releasing the Wiz Khalifa- and Chris Brown-supported "Talkin' Bout" as the next single from 2013 album "Stay Trippy," a new album is currently in the works, with a tentative release date before the end of the year. The album, Juicy J's fourth as a solo artist, is currently titled "The Hustle Continues" and could be out by September.