Gigi and Bella have several other siblings, including brother Anwar Hadid, Mohamed and Yolanda's youngest child. They also have two older half-sisters — Marielle and Alana Hadid — who Mohamed welcomed with his first wife, Mary Butler.

So, here’s a plot twist we didn’t see coming. Gigi and Bella Hadid just revealed that they have a half-sister. Her name is Aydan Nix, she’s 23, she’s living in New York, and she’s stunning and stylish, too.