US Magazine has new details on Chris Brown’s duet with Rihanna. On Tuesday, it was reported that Brown, 19, is back in a Santa Monica, Calif., studio with Rihanna, 21, working on an as-yet-untitled duet with producer Polow Da Don. “The theme is about being stronger and growing stronger in a relationship,” a source tells Us. “The song was originally created for Rihanna before the fight. However, it wasn’t initially slated for Chris to be on the song.” Adds the insider, “The funny thing is, the song expresses the emotions that both Chris and Rihanna are feeling at this moment – facing challenges and overcoming the ups and downs of a relationship in which you become stronger.” The source adds that Brown and Rihanna “were very playful in the studio.”

In a statement, Polow Da Don (who has worked with the Pussycat Dolls and Usher) tells Us: “My heart goes out to both Chris and Rihanna for what has happened in the past. They are both great artists to work with, and I wish them well.”

Brown allegedly attacked Rihanna Feb 8 in Los Angeles. He later turned himself in to Los Angeles Police and was released on $50,000 bail. On March 5, he was charged with two felonies – assault by means likely to create great bodily injury and criminal threats. He is to be arraigned April 6. If convicted, he faces anywhere from probation to four years and eight months in state prison.

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