Lily Aldridge in black mini dress and black boots at Mert and Marcus book launch

Lily Aldridge at Mert & Marcus book launch during New York Fashion Week on September 7 2017

WHAT SHE WORE: Lily wore black plunging mini dress from Saint Laurent and black over the knee boots from Saint Laurent

BUY:

DRESS: SAINT LAURENT CLASSIC FITTED DRESS

BOOTS: SAINT LAURENT NIKI VELVET OVER THE KNEE BOOTS BLACK at Forward by Elyse Walker at Barneys at Saks Fifth Avenue