Gigi & Bella Hadid A Pair of Bums

9/14/2015 1:14 PM PDT

Gigi & Bella Hadid -- A Pair of Bums (PHOTOS)

Sisters Gigi and Bella Hadid let their buns hang out as they walked the runway Monday for Tommy Hilfiger during New York Fashion Week.

Forget bikinis, these two should be the spokeswomen for genes.