Now that Robin Williams is calling Broadway home in the new play Bengal Tiger at the Baghdad Zoo, plenty of celebrities are heading to the Richard Rodgers Theatre to cheer him on. During the April 9 weekend Michael J. Fox and his wife Tracy Pollan paid a visit to the Zoo alongside fellow star couple Jennifer Grey and Clark Gregg. Also spotted backstage were Bill Pullman, Marsha Mason and Broadway icon Ben Vereen! Here's your chance to mingle with the stars by clicking below.