America Ferrera and Amber Tamblyn showed their support for Sisterhood of the Traveling Pants co-star Alexis Bledel during opening night of her new Off-Broadway show, Regrets. The Gilmore Girls actress made her stage debut in the drama, set in 1954 on a Nevada desert “divorce ranch.” Click through the gallery to see Hilary Swank, Lily Collins and more stars at last night’s hottest events.