"She x She ... always great to see my Lil Kitty cat!!!#Perry," RiRi captioned this pic. The "Diamonds" singer also posted another photo of them where Katy is playfully covering her eyes and making a funny face.
The singers have been friends for quite some time and it was believed that they hit a rough patch in their relationship when Katy didn't approve of Rihanna going back to Chris Brown.
Also, during a recent interview, Katy gave RiRi a sort of backhanded compliment, which some thought might have been a result of continuing contempt between the two.
Fortunately, it looks like they have put the past behind them and are back to being best gal pals!
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Gallery | Katy Perry's Red Carpet Style