Supermodel Gigi Hadid confronted an intruder on the catwalk at the Chanel show during Paris Fashion Week.
Comedian Marie S'Infiltre - real name Marie Benoliel - climbed onto the runway wearing a Chanel-style dog tooth-patterned outfit and a black hat.
After getting most of the way round the runway, Gigi Hadid stepped in and led her away.
It seems to have been a publicity stunt rather than protest.
A Chanel spokeswoman said: "We are not going to make a drama out of it."
Lots of people watching the show captured the moment on camera and shared it on social media.
You can see a load of models walking in a row, when the comedian jumps up and joins in.
Just as Marie was getting into it and posing with her hands on her hips, Gigi - who looked unimpressed - blocked her way.
It also looks like a tough gig for the security guards - who seem unsure of who they're meant to be looking for.
Gigi Hadid has been trending on social media because of the way she handled the situation.
Gigi Hadid giving a whole new meaning to fashion police— ARMY™ 🌬 ARSD 📌 (@reallymoonchild) October 1, 2019
— someone crashes the Chanel catwalk and Gigi escorted her out pic.twitter.com/PbVNn0Gjo4
In other news, Gigi Hadid saves the finale of the Chanel spring/summer show when a random guest decided to join models!! She blended in so well the security had a difficult time finding her. pic.twitter.com/h86mToNUls— 🦂 (@pradaVsme) October 1, 2019
The supermodel hasn't commented on what happened but has shared other people's Instagram stories from the show.
In one post she's tagged in there's the caption "superhero @gigihadid".
Gigi shared it on her story and added a gif of a winking cat woman.