A shaken Britney Spears was clearly shocked when some dude ran up on the stage during her Las Vegas show.

In a video taken by a concertgoer, the security guard is seen wrestling him to the ground then body slamming. You can hear Britney saying, “What’s going on? …Oh no!”

“The two men were drunk and wouldn’t put their shirts back on,” Jonathan Groce, who was there, recalled to Entertainment Tonight. “Security pushed one of the men against a wall. That man started hitting the security officer. And that’s when the other man ran down the aisle and jumped on stage during ‘You Drive Me Crazy.’ That’s when everything came to a complete stop. That’s when Britney said, ‘Is everything OK?’”