Usually Mercedes-Benz Fashion Week is about the clothes, but the Prabal Gurung show is making headlines for what one person wasn't wearing.

The designer's show on Saturday in NYC was interrupted by a streaker, who ran onto the runway in a trench coat, leopard print g-string, crown and tube socks -- flashing his nearly-nude body to the crowd.

Luckily, a security guard quickly chased the wild, butt-baring dude off stage, so the show was able to continue without another hitch.

We really have to commend Gurung's real models, who continued to walk it out despite a crazy, half-naked man running all over the catwalk.

See it all go down in the video below. WARNING: Some g-string booty ahead!

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