Behind the Scenes of the Fashion s Night Out PSA

You've probably already seen the Fashion's Night Out public service announcement during a New York cab ride, on TV, or on Vogue.com, but what you haven't witnessed is everything that went into creating this cameo-filled short. Get an exclusive behind-the-scenes look at the video featuring Justin Bieber, Taylor Swift, Usher, Olivia Wilde, Glee'sDarren Criss, and more.