Did Rihanna and Kesha record a duet?

After Kesha instagrammed a photo of a napkin with Rihanna's classic "R" signature on it, fans started buzzing away that the two divas recorded a new tune together for Kesha's upcoming album, Warrior. Sadly, M has it on record that's not the case. "There's definitely not a Rihanna song on it," Kesha's producer says about the album. Aww, maybe next time!