Hilary Duff and Haylie Duff Photo

From: Photo Flash: Tiesto, Hilary Duff, Aziz Ansari and More Party at Hakkasan Las Vegas

On Friday, May 3, Sin City's newest nightclub, Hakkasan Las Vegas at MGM Grand was the it place to be as thousands of clubgoers lined up at the doors to see Tiësto perform for the firsttime at the nightlife mecca. In addition, the highly anticipated Hakkasan Restaurant opened its doors for the first time as A-List celebrities including Hilary Duff and husband former Canadian professional hockey player Mike Comrie, Haylie Duff, Entourage star Adrian Grenier, actor/comedian Aziz Ansari and Tiësto flocked to haute Cantonese hot spot get a taste of the award-winning cuisine. Scroll down for photos from the festivities!