Donna Karan, Emmy Rossum, Rita Ora, Melanie Fiona Photo

From: Photo Flash: Bernadette Peters, Emmy Rossum, Donna Karan and More at DKNY25 Birthday Bash

On Monday, September 9th, during New York Fashion Week, DKNY celebrated its 25th anniversary with a birthday bash that featured special live performances by Rita Ora followed by surprise guest sets from Iggy Azalea, A$AP Rocky and A$AP Ferg. Hundreds of New York's most influential names came out to toast the quarter-century milestone with designer Donna Karan. Scroll down for photos from the party!