The annual Met Costume Institute Gala has a reputation for high-drama looks and with a guest list that included Katy Perry in an LED-lighted dress, this year’s event didn’t disappoint. The event, which honored the New York museum’s new exhibit, American Woman: Fashioning a National Identity, was also something of a public-service announcement for struggling celebrity couples: Exes Sienna Miller and Jude Law reunited on the red carpet together, as did Jessica Biel and Justin Timberlake, who have been plagued with breakup rumors since Timberlake began filming with ex Cameron Diaz on the set of Bad Teacher.