Rihanna recently confirmed that Britney Spears will be featured on her S&M Remix.
According to Gossip Cop, the track will be released very soon. Rihanna tweeted:
"I got a #SEXY collabo comin your way supa dupa soon!!!! OH YEAH!!! By popular demand… Its BRITNEY B***H!!!! @britneyspears One of the biggest worldwide popstars! U gangsta #EPIC."
Source - Gossip Cop