Watch Nic Rouleau, Maggie Smith, the Queen & More Wish a Happy Opening to London's The Book of Mormon Cast

Kudos to the Chicago cast of The Book of Mormon for the creative opening night video for their musical brethren across the pond. Mormon stars Nic Rouleau, Ben Platt, Pierce Cassedy & more tapped into their inner-Anglophiles to come up with a very British parody of Mormon’s opening number “Hello.” During the song, the Chicago stars (with a little help from her majesty the Queen, Maggie Smith and Mary Poppins) wished a very happy opening night to Broadway.com Audience Choice Award winner Gavin Creel & co., who celebrate The Book of Mormon’s London opening night on March 21. Click below to laugh along with the Chicago Mormon stars, and congratulations to the London cast!