By Margeaux Watson
Updated March 10, 2009 at 04:26 PM EDT

Chris Brown and Rihanna are collaborating on a duet for Brown’s next CD, due out later this year, reports E! News. In addition to reportedly making a song together, the pop stars are said to be working on solo material with producers Polow Da Don and Adonis Shropshire at a Santa Monica recording studio. At press time, Brown’s manager did not respond to a request for comment, while a rep at Rihanna’s management company says, “We have no comment. The only statements are the ones that have been released thus far.”