Katy Perry's Seen Her Opening Act Naked

Lauren Dukoff/BillboardWhen a massive star goes on tour, chances are they haven't even met their opening acts, let alone know them personally.  But Katy Perry's different: not only does she know one of her opening acts for her Prismatic tour very well, but she's actually seen that person naked.

We're talking about Kacey Musgraves, the award-winning country star who Katy has tapped to open for her on the North American leg of the Prismatic tour.  The two singers, who recently taped an episode of CMT Crossroads together, grace the cover of the new issue of Billboard magazine, and in the interview, Kacey confirms that Katy has seen her naked.  "A couple times, and it won't be the last," she adds.

How did the two get together in the first place?  Katy tells Billboard that after she heard Kacey's acclaimed country hit "Merry Go 'Round," she instantly connected with it, so she tracked her down online and reached out to her about collaborating.  The songs they wrote together didn't end up on Katy's PRISM album, but the two remained friends. 

"I think [Kacey] straddles the line like I straddle the line of appropriateness and still maintaining a sexuality that is healthy and exciting," Katy tells Billboard. "And it's not all about that. It's about sending inspiring and empowering messages and being a think-for-yourself type of woman."  The two plan to duet onstage when Kacey joins Katy's tour in August.  Get a preview by watching the CMT Crossroads episode on June 13.

Copyright 2014 ABC News Radio