Rihanna parties with Katy Perry, straddles 'naughty' Santa in viral Instagram PHOTOS: Ex-lovers Drake and Chris Brown not on RiRi's mind

Rihanna always has something interesting to post on Instagram. Like this naughty holiday photo:

badgalriri: "We tried to convince Santa that being a naughty girl isn't so bad after all!!....making the list or nah?"

Hey, gotta love her!

Apparently RiRi's friends like to get down-and-dirty with Saint Nick, too:

badgalriri: "@mforde11 on her Santa 69!! #phuckyoNorthpole #gimmedatsouthpole."

There's never a dull moment in Rihanna's world.

Oh, and remember that time the "Diamonds" songstress was "feuding" with BFF Katy Perry?

Rihanna and Katy Perry Feud: BFFs Diss Boyfriends, Chris Brown Doesn't Deserve Second Chance, John Mayer a 'Sleazeball'

Well, they're friends again:

badgalriri: "She x She ... always great to see my Lil Kitty cat!!! #Perry."

The two pop beauties seem to be partying at a club together in the goofy photos... no man can come between these gal pals!