Some oblivious DJ reportedly angered guest of honor Rihanna at Jay Sean’s All or Nothing Cash Money UK launch party over the weekend, when he “accidentally” put on a Chris Brown song, just minutes after Rihanna entered the room.

According to sources, Rihanna and her friends all stormed out of the party as soon as the song came on. The event’s organizers are apparently just a bit upset about the incident, as they had spent about £100,000 on Cristal just to get Rihanna to show up.