Gigi & Bella Hadid -- A Pair of Bums (PHOTOS) Gigi & Bella Hadid A Pair of Bums 9/14/2015 1:14 PM PT

Launch Gallery Getty

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.

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