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Katy Perry has again expressed her desire to collaborate with Rihanna.
The 'Teenage Dream' star said she was hopeful that the duet would come off in the future, but only if the song was right.
"I hope so, one of these days," she told Capital FM's Showbiz reporter Kevin Hughes when asked about her plans to work with Rihanna.
"But the thing is we're not just going to cash in on that idea unless it's bulletproof, because you really only get one shot at that."
Katy added: "We're friends above and beyond all the other stuff, so if we're going to work together it has to be dynamite."
Meanwhile, Katy also said she was a big fan of Rihanna's new video 'We Found Love'.
She said Rihanna had shown a "really honest side" with the video for the first single off her new album 'Talk That Talk'.