A source close to Jay-Z says the music mogul is disappointed in protege Rihanna's recent duet with ex-boyfriend Chris Brown, who famously physically abused her back in 2009.

"Jay was absolutely disgusted by what Chris did to Rihanna," the source told Radar Online. "Jay doesn't understand how a man could ever lay hands on a woman; it just goes against who he is and about. Chris is absolutely dead to Jay, he wants nothing to do with him ever.

"Now that Rihanna is hooking up with Chris and recording songs with him, Jay is deeply disappointed in her actions," he continued.  "He can't fathom why Rihanna is doing the things she is doing. He understands the need for forgiveness, but he is adamant that Rihanna shouldn't forget what Chris did to her. Jay wonders what kind of message this is sending to Rihanna'syoung female fans. Rihanna knows how Jay feels about Chris, but she doesn't care, she is going to do what she wants."

Chris Breezy and RiRi have released two songs which features both of them recently: her song "Birthday Cake" and his "Turn Up the Music."

Now that Jay-Z is a proud father to daughter Blue Ivy Carter, "he is even more protective of the women in his life," the source added. "Jay has told Rihanna he will never give his blessing for what she is doing with Chris. He has told her, this isn't going to end well, it never does. In Jay's opinion, Chris has rage issues that he doesn't think have been dealt with."

In related news, Radar Online is also reporting that Rihanna has promised Brown to support him through the cellphone-stealing ordeal, according to another source.

"Chris told Rihanna that he absolutely 1000% didn't steal that phone, and Rihanna has told him she believes him," the source said. "Rihanna has also told Chris that she will stand by him during the investigation, and whatever the future holds. This was extremely humbling to Chris given their tumultuous past, and he told her how much he appreciated her unwavering support to him, despite the criticism she has endured for recording songs with Chris and welcoming him back into her life." —Mariel Concepcion