The pair teamed up for remixes of Rihanna's 'Birthday Cake' and Brown's 'Turn Up The Music' last month and have each faced a backlash from their fans.
Talking about the duets, a friend told More! magazine: "She'll have recorded with Chris not to shock but to remind the world that he's paid his dues and moved on, and that he's a very talented singer.
"I think she feels strongly that one bad moment in his life should not define who he is forever."
The collaborations follow their turbulent relationship which saw Brown convicted of assault against Rihanna back in 2009.
Rihanna recently responded to a fan on Twitter who criticised her decision to sing with Brown by mocking her appearance.
> Jay-Z 'deeply disappointed' by Rihanna, Chris Brown duet
Listen to Rihanna and Chris Brown's 'Birthday Cake' below (Warning: Contains strong language):