Green Day frontman Billie Joe Armstrong has previously taken the stage with the American Idiot cast at the Grammy Awards, Tony Awards, audience talk back sessions and Monday Night Football, but the iconic rocker upped his dedication to the show even further by jumping into the production itself! On September 28 Armstrong began a one week only stint in Idiot (through October 3) as devious drug dealer St. Jimmy. Not surprisingly, a full house of hardcore Green Day fans filled the St. James Theatre to watch Armstrong make his Broadway acting debut. Even the cast couldn’t help but gush during the show’s riotous curtain call. Click below to check out the head of Green Day take the Great White Way by storm!