Thursday, March 3, 2011 8:46pm ET by  
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Rihanna and Katy Perry planning duet

Rihanna has revealed that she and pal Katy Perry are planning to collaborate on a song.

“We want to hopefully make something,” she says. “We are talking about it right now but it’s hard because we are both so busy. It will be something fun, something out of the box."

RiRi and Katy go way back and the ‘S&M’ singer even planned Perry’s Las Vegas bachelorette party. Unfortunately she couldn't make the wedding in India due to work commitments.

Check out Rihanna talking about Katy’s bachelorette party, amongst other things, on Radio 1 here: