It's nobody's business.
The collaboration comes 9 months after the two scorned lovers damn near blew up the internet when their "Birthday Cake" remix and "Turn Up The Music" remixes hit the 'net.
GlobalGrind was present at RiRi's Unapologetic listening party at Jay-Z's 40/40 in NYC, and this collaboration was undoubtedly the most anticipated.
"You'll always be mine/ sing it to the world/always be my boy/I'll always be ya girl/ain't no business/but mine and my baby" sings Rihanna.
"Let's make out in the Lexus, there's no other love just like this/a life with you I wonder can we become loves persona," sings Chris.
Rihanna's currently on her "777" promo tour, and her seventh studio album Unapologetic hits the stores November 19.
Take a listen to RiRi and Chris Brown's collaboration below!