Gigi Hadid turned 27 on April 23 and partied at the private New York club Zero Bond with pals Blake Lively, Emily Ratajkowski, Martha Hunt, Helena Christensen and Antoni Porowski, plus her sister Bella Hadid – who arrived with boyfriend Marc Kalman and brother Anwar Hadid. Gigi wore a semi-sheer white lace outfit consisting of a corset top and matching long flared pants and long jacket, paired with white pumps. Blake, who the birthday girl had recently jokingly asked to bartend at her party, arrived in a vibrant violet Sergio Hudson mini dress. She paired the look with a bright red clutch and matching platform pumps. Emily also opted for a bright look, wearing a sleeveless coral and blue fitted, cut-out maxi dress, pared with black sandals. Bella sported a sleeveless, black pinstriped, button-down cut-out top, a matching tiny flared micro mini skirt and black knee-length pointed leather stiletto boots. "Thank you for being the best sister, mom, daughter, human bean ever. You teach me something new every day and sometimes I just smile because I feel so lucky to be your baby sister," Bella wrote on Instagram.