'Roar' hitmaker Katy Perry has teased that a collaboration with Rihanna might be in the works because it's something that keeps getting suggested by their respective followers. 

During an interview with America's 102.7 KIIS FM over the weekend, Perry teased that both of their fanbases are desperate for a duet so they don't want to disappoint:

"We've actually been talking about it for years so we can't let anyone down. We have to do the best song ever. Beyond that, I think we'll definitely get around to it and when it happens, you are going to know."

Earlier this week, Perry opened up about she planned to celebrate Christmas and confessed that she hopes to just relax and eat:

"I have to rest during Christmas because I kick off my tour in May (14) and there's about three months of rehearsals and prep. I basically just eat and hibernate and eat and hibernate... and spontaneously pass out on the couch. It's a very normal Christmas. I've got muffin tops everywhere. My whole body is made of muffin tops."