*Chris Brown has not just been hanging with his ex-girlfriend Rihanna, but the New York Post is reporting that the singer, who was convicted of assaulting the starlet three years ago, was in New York last weekend hanging with her cousins and grandfather Lional Brathwaite at Jay-Z’s 40/40 to watch the Miami Heat/Boston Celtics playoff game.

”Rihanna arrived first in a yellow cab, with her family and friends, and was escorted to a private room,” a source told the Post. “Brown arrived a little later and joined her and her family. They sat on the same couch together rooting for the Heat. There was no sign of his girlfriend Karreueche Tran.”

Chris and his friends left after the game, while Rihanna’s group stayed longer.

The Post further reports that Chris and Rihanna’s rekindled friendship is a source of concern to Rihanna’s management following the criticism she received for working with Chris on two tracks, “Turn Up the Music” and “Birthday Cake” earlier this year.

The source said: ”Everyone in the business assumes she and Chris are getting back together, and it is only a matter of time before they’ll be more public about it. ‘It’s like she is testing the water – first they work on music together, then they hang out in a friendly way, so the public won’t be completely shocked when they step out together publicly.

”There is also a tug of war at Roc Nation over the final say on what she is doing. But everyone agrees they can’t control Rihanna and can’t stop her seeing Chris, no matter how much they fear the negative public reaction will be. It means she probably won’t release another album this year, for fear of a backlash.”