Rihanna and Nicki Minaj shot the video for "Fly" over the weekend, and the two friendly gals wasted no time to get cutesy -- and playfully flirty -- with each other.

"Me and Nikki in our new crib, lol! Gettin busy on set of FLY!!!" Rihanna tweeted along with the above twitpic. "Its so hard to keep my hands off!"

A short while later, Nicki Minaj replied to her "friend with benefits" with some rules and regulations. "If we're gonna liv 2gthr and hook up u gotta learn how 2 spell my name! Lmaooooooo," she corrected, adding the disclaimer at the end, "Gossip Gossip ni#@a just stop it! :p."

In the photo, Rihanna is seen sporting long, bone-straight, fire-red hair with smoky eyes as she makes a kissy face and Nicki, who is sticking her tongue out, has super long false eye-lashes and is wearing a fitted pink top with metal spikes all over.

Looks like girls just wanna have fun.