Nicki Minaj and Rihanna prove that girls will be girls — even if they are platinum-selling, chart-topping megastar girls.

The hitmaking ladies were filming the visual for the MC's next single "Fly" over the weekend, and on Saturday the Barbadian-born songstress tweeted a photo of the two on set making sassy faces in full "Fly" girl regalia.

In the picture Rihanna sports pin-straight, shoulder-length, crimson-and-burgundy locks, smoky eye makeup and a low-cut, black top as she leans on Nick's shoulder. Minaj mugs for the camera rocking super-long false eyelashes with a swipe emerald-colored glitter on her lower lids and a pink bustier adorned with silvery spikes.

"Me and Nikki in our new crib, lol! Gettin busy on set of FLY!!!" Rihanna wrote. "Its so hard to keep my hands off!"

About an hour later Minaj laid down some guidelines for her new pretend paramour and roommate.

"Lol. If we're gonna liv 2gthr and hook up u gotta learn how 2 spell my name! Lmaooooooo," she wrote. The Young Money raptress followed up with sly a disclaimer, lifting a line from her beastly Kanye West collabo "Monster," writing, "Gossip Gossip ni#@a just stop it! :p."

Minaj spoke last week about teaming up with her "Fly" collaborator on the video set, and while she remained tight-lipped about the concept, she maintained that fans can expect a major clip to accompany the Pink Friday cut.

"We're shooting the video with Rihanna for 'Fly' this weekend," Nicki told E! News on Thursday. "We're going to save the world in more ways than one with the video, and that's all I can say about that."

Perhaps Minaj was ready for any fresh remarks from Rihanna, as she playfully conceded the Loud songstress can get a little touchy-feely.

"I love Ri Ri!" she gushed. "I mean, when she's not grabbing my ass, she's a sweet girl."

Are you excited to see Nicki Minaj and Rihanna in the "Fly" video? Let us know in the comments!