World's Most Beautiful

9 Celebrity Sisters You've Most Likely Fallen in Love with Through the Years

In honor of PEOPLE's World's Most Beautiful issue, we're rounding up the buzziest, most successful siblings around

CARA & POPPY

Talk about model behavior! While Poppy and younger sister Cara Delevingne vary when it comes to style choices and personality, that doesn't mean they're not close. Cara, the edgier of the two model-sisters, swapped her rocker style for an airy dress when it came time to serve as bridesmaid for Poppy's 2014 wedding.