Two of pop's biggest music superstars have gotten together for a little S&M fun.

Rihanna and Britney Spears have released a remixed version of Rihanna's hit "S&M", which features Britney trading verses with the Bajan singer.

I didn't think Britney would be able to pull it off. After all, Rihanna has a much stronger voice that Britney. But, Britney actually pulls it off - perhaps with some studio help, but it's minimal. I can't remember the last time I heard Britney actually sing - with conviction, to boot!

The song comes just in time to be re-introduced as a dirty summer jam. It also is bound to help Rihanna out, who's been struggling to sell tickets to her tour. 

Take a listen to a leak of the track below!