The supermodel was joined by other special guests including Crystal Renn, Erin O'Connor and Coco Rocha as they turned out to model the US fashion designer's latest range of beautiful floor-length gowns.
While the 42-year-old brunette surprised many in the audience with her appearance at the spring show, Zac's collection of evening and cocktail dresses in organza, silk faille, tulle and taffeta was the main feature on the runway.
Diane Von Furstenberg attracted a star-studded front row at her show yesterday afternoon, which saw Sarah Jessica Parker, Oscar De La Renta and VALENTINO take in the wrap dress designer's new collaboration with Google, entitled Glass by Google.
Google co-founder Sergey Brin was also present to see the futuristic glasses, which feature a tiny in-built camera, shown off on the catwalk.
Yohji Yamamoto's label Y3 celebrated its 10th birthday at Fashion Week yesterday and designer Tracey Reese - whose creations have been worn by US First Lady Michelle Obama - unveiled her spring/summer 2013 easy-to-wear shift dresses and loose-fitting shirts.