Are these two hinting at a secret project in the works? Why else would Rihanna and a shirtless Donald Glover post for a selfie together?

Here are the options: a musical collab (Glover's leaning on a guitar), or Glover's long-time collaborator director Hiro Murai's first feature film Guava Island, set in Cuba. That's pretty much it -- there are no more possibilities ... NO, they can't be hooking up; Glover just welcomed a second son with his long-time partner Michelle and Rihanna's sworn off men after breaking up with her b-friend Saudi billionaire Hassan Jameel in June.

Glover's set to perform at Rihanna's annual Diamond Ball in September, as his musical alter-ego Childish Gambino. So by all accounts these two are good pals. Cool, because they're two of our favorites!