Kevin Mazur/Courtesy Saks Fifth Avenue
New York Fashion Week has officially started, and the stars are already out in droves. Last night, Charlize Theron, Blake Lively, Michelle Monaghan, Alexis Bledel and Taraji B. Henson and Vogue editor Anna Wintour herself turned out to help Saks Fifth Avenue unveil its new designer floor. Designers including Carolina Herrera, Oscar de la Renta, Zac Posen, Marchesa’s Georgina Chapman, Vera Wang and Christian Siriano also helped to celebrate the 32 unique cocktail dresses created just for the floor, which were on display. For Charlize, who helped host the event in a floral-print Dior for Saks Fifth Avenue exclusive, feeling at home among the fashion world’s heavy hitters was nothing new. “I started in the fashion industry,” the actress tells PEOPLE. “It’s a harsh business. You have to have a thick skin and be resilient.” Gossip Girl star Lively arrived dressed in a stunning blue sheath from Victoria Beckham’s dress collection, while her costar and off-screen boyfriend Penn Badgley kept it casual in trousers and a button-down, as he joked to PEOPLE, “I always dress down, that’s a secret. Pretty much always and she dresses up all the time.” Getting ready was simple for Bledel, who showed off a gorgeous croc-textured one-shoulder frock by Siriano. “It was pretty quick,” Alexis told PEOPLE of finding deciding on that night’s look. “We found this sculptural, beautifully colored blouse and then the skirt, I just loved the fabric of the skirt.” Follow us at Twitter.com/StyleWatchMag for all the latest Tweets from the Tents!