Bella Hadid wore one of the night's sexiest dresses [1] when she stepped onto Sunday's Grammy Awards red carpet wearing a strategically slit Alexandre Vauthier gown [2] — and, oh yeah, it was her red carpet debut [3] with boyfriend The Weeknd.

Even though her first dress was a knockout, the custom is to change before attending any award show afterparty [4]. So Bella did a quick outfit swap, trading out one chic black dress . . . for another.

Bella's second look was from Mugler, centered around a little black dress with a deep v-neck and metal details. She finished the outfit with over-the-knee black leather boots, a small black clutch, and a simple choker.