Don’t mess with Taylor Swift.

The “Karma” singer interrupted her Philadelphia concert on Saturday night and appeared to yell at a security guard over an interaction with a fan.

Swift, who was wearing a sparkly two-piece outfit, gestured multiple times in an attempt to diffuse the situation on the floor.

“She’s fine,” she eventually said while singing her song “Bad Blood.”

“She wasn’t doing anything,” the Grammy winner added, before yelling, “Hey, stop!” multiple times.

The video, which was taken by TikTok user Briana Layfield, was captioned, “hey @Taylor Swift THANK YOU from all of us on the floor for yelling at that security guard.

“he was a pain in the ass the entire night and the fact that this happened during #badblood made it even better  PS show was PHENOMENAL  Philly night 2”

However, it was unclear what the security guard was doing exactly to warrant Swift’s response.

One fan claimed on Twitter that they were being “aggressive,” saying, “They fully kept putting their hands on us to physically push us off of the barricade instead of just telling us to move.”

Another fan account claimed that Swift was “trying to stop a situation from further arising between security and some fans at tonight’s show.”