Chris Brown With Rihanna

Collaboration between Rihanna and her ex-boyfriend Chris Brown surfaced on Monday, April 20, and the track features some seriously raunchy lyrics. 

The estranged lovers, who had an infamously combative relationship and multiple ugly breakups, reportedly recorded the song more than a year ago for potential inclusion on Brown's 2014 album, x. While it never made it onto the record, the track, called "Put It Up," has finally seen the light of day.