Beyonce Captured Playing the Saxophone (Photo)

The singer posted the picture to her Tumblr account.

Who runs the world? Girls. But who plays the sax? That would be Beyonce, based on a black-and-white photo posted to the superstar's Tumblr account.

Whether the photo was part of a recording session for her upcoming album -- the singer's fifth studio effort -- or her upcoming half-time show extravaganza at the NFL Super Bowl on Feb. 3 isn't entirely clear.

But there's something undeniably thrilling about seeing the glamorous pop icon -- who graces the cover of GQ's upcoming "100 Sexiest Women of the 21st Century issue" -- playing the sexy instrument synonymous with John Coltrane and Charlie Parker.