There's a fistful of male guest-stars on Rihanna's Unapologetic LP -- from Future oozing Auto-Tuned game on "Loveeeeeee Song" to Eminem spitting Novocaine-fueled non sequiturs on "Numb" -- but we bet none lit up your feed like Chris Brown did when his contribution to the chart-topping album landed on the 'Net in November.

Because no matter how you feel about their up-and-down union, it's impossible to deny the virtual rubbernecking that happens every time Brown and Rihanna book a studio session together. The musical pairing has yielded a remix of the pounding "Birthday Cake" and given naysayers the defiant "Nobody's Business." Now, the duo are set to do it again, Breezy confirmed to MTV News when we sat down with him in our Times Square studio on Friday.

"So we did 'Nobody's Business' for her album, and then I wrote a song, it's called 'Put It Up.' It's more of an R&B record," said the singer, whose single "Fine China," from his upcoming album X, dropped on Monday (April 1). "I wanted to do an R&B record with Rihanna because I didn't want it to be the same four-on-the-floor, pop," he added, alluding to the synthy sound of their previous duets. "At the end of the day, that's what they expect from us, so I wanted to do more of a record that nobody really heard her sing on as far as that genre."

Um, did Chris take a shot at Drake on Jeezy's "R.I.P." remix?

Explaining that the track will be "youthful and at the same time sexy," Brown naughtily teased the meaning behind the title, too, lest fans get it confused: "You know what 'It' is, so just 'put it up.' "

Now that the pop stars are regularly teaming up in and out of the studio, we wondered how the reunited twosome blend their respective recording styles. Does RiRi scatter scented Diptyque candles and post Bible verses around the booth to set the mood? Does CB pull all-nighters or get in and get out?

"It's different," the Fortune star said. "Me, I'm in the studio like [a] ball of energy; I don't really write ... I never write, it's all off of what's up here," he revealed, pointing toward his head. "Whether it be rapping or me singing, I'll go sing a melody, come up with a concept and write it that fast and we'll knock out the song in like an hour. ... With her work ethic, it's the same -- she's just as liberal and vibrant. She goes in the studio and it's easy for her, like it's nothing."

Brown went on to recall one casual session, in particular, that left him marveling at the Bajan beauty's ability to belt it out, quick and dirty.

"I remember she was doing her album and I was at the crib one day, and she was just recording in the house ... and she was just sitting there, the TV was going -- [the sound] was off -- but she was sitting there with the headphones, singing, the top of her lungs, killing the song. I was like, 'Woah, she do it just like me. That's effortless.' "

With at least three joint tracks in the well and another on the way, by our math, Brown and Rihanna are officially gunning for that Marvin Gaye/ Tami Terrell run (without the tragic Motown ending, of course). So we prodded the Virginia native: Is an EP inevitable?

"[That] might be crazy," Chris laughed. "You gotta wait though. X and then you get the Rihanna and Chris Brown album!"

What do you think of Chris and Rihanna teaming up for another song? Sound off in the comments!