The model pair turned heads in bold print dresses at Prabal Gurung's show at Skylight at Moynihan Station.
Victoria's Secret star Lily, who attended NYFW for the first time as a guest rather than for work, wore a sleevless, collared dress made up of varying red, white and black patterns and accessorised her look with simple black heels and an elegant clutch bag.
Lily and Gigi paid sartorial tributes to Prabal Gurung
Gigi, 19, opted for a black and navy dress with a vibrant patterned panel running down the front.
Both ladies swept their hair off their faces, with Lily styling her black locks in a sleek bun and Gigi tying her blonde waves into a side plait.
Lily and Gigi were joined at the show by The Leftovers actress Margaret Qualley, who wore a cobalt jumpsuit.
The duo were joined by actress Margaret Qualley
The trio posed alongside the runway as they prepared to see the US design house's spring 2015 collection.
The Duchess of Cambridge is a fan of Singapore-born Prabul's designs and fittingly opted to wear one of his chic silk dresses when she visit Singapore in September 2012.