James Corden and cast of Crosswalk the Musical MARY POPPINS Photo

From: Photo Flash: First Look - James Corden Stops Traffic for 'Crosswalk the Musical: MARY POPPINS'

Appropriately, the troop put on a production of MARY POPPINS, recruiting the acting talents of Sir Ben Kingsley in the role of Bert. Corden himself donned the iconic nanny costume to take on the title role.