Rihanna showed up several hours late to an event congratulating winners of her “Shine Bright Like A Diamond” contest, Friday.

The singer left students at Barrington High School, near Chicago, waiting for over three hours, before finally showing face. She was scheduled to arrive at 2 p.m., but didn’t show up until after 5:30, while 2,500 students—who were told to arrive at 1:30 p.m.— awaited her arrival.

Over an hour into the wait, Rih Rih tweeted that she was on her way, later posting a photo of being stuck in traffic. By the time she arrived, some students had already left, but for the ones who stayed, Rihanna gushed over their winning video submission. “I was so impressed and touched seeing the video. I wanted to come and express that to you in person.” she told students.