The Bajan songstress partied with her fellow chart-topper Katy on Saturday night (30 December) and it seems like the pair were both delighted to spend some quality moments together after a hectic few weeks of promotional trips and touring the globe.
RiRi documented the special evening via a couple of candid snaps, which were taken by her right hand woman and childhood friend, Melissa Forde.
One picture shows 29-year-old Katy - who will perform during the X Factor final later this month - playfully covering her BFF's eyes while she clutches a glass of wine.
Rihanna wrote the caption: "Caught by @mforde11 She x Perry"
RiRi's hair is seen pinned up in the controversial 'doobie wrap' style that she sported at the American Music Awards last month and she also appears to have gone for a low-key look, as she is sat in an oversized sweatshirt.
Another photo uploaded by the 'Diamonds' star sees Katy looking smart and chic in a gold top, teamed with a metallic printed jacket and matching shirt.
She is sporting a large gold watch on her wrist too, while gazing at Rihanna, who is holding up her hand to resemble a gun.
RiRi captioned the snap: "She x She ... always great to see my Lil Kitty cat!!! #Perry"
But the fun hang outs didn't end there for Rihanna, as she then stole a few moments with Father Christmas!
Wearing a large star printed bomber jacket, RiRi can be seen sat on top of Santa Claus in an amusing picture uploaded to her Instagram page.
The 25-year-old even seems to be sticking her tongue out at Santa while holding on to a drink.
She wrote beside the photo: "We tried to convince Santa that being a naughty girl isn't so bad after all!!....making the list or nah?"
Well, this is a new take on asking for presents if we ever saw one!
What do you think of Rihanna's wrapped up hairstyle? Let us know below, as the best comment each week across the website wins £50!
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