It's summertime and the livin' was easy at Cambridge's American Repertory Theatre on August 31, where the Broadway-bound Porgy and Bess had its opening night. Broadway.com ventured to the Massachusetts theater to catch the show's stars (four-time Tony winner Audra McDonald, Norm Lewis and David Alan Grier) as they celebrated with their fellow Catfish Row citizens. Porgy and Bess won't begin Broadway performances until December 17 (followed by opening night on January 12, 2012 at the Richard Rodgers Theatre), but you can get a sneak peek of the revamped musical with these exclusive photos. Click on to join the cast in celebration!