Here come the Bridesmaids! Co-stars and friends Rose Byrne and Kristen Wiig sat side-by-side at Marc Jacobs's runway show last night before heading over to the New York Yacht Club for a celebration in the designer's honor. Work that cheeky side smile, Rose! Click through to see Hailee Steinfeld, Kelly Osbourne, and more stars at Fashion Week parties.
Jamie McCarthy/Getty Images for Marc Jacobs