Kitt shot to stardom with her performance of the song "Monotonous" in Leonard Silliman's New Faces of 1952. She has also appeared on Broadway in Bal Negre, Mrs. Patterson, Shinbone Alley, Jolly's Progress, Timbuktu!, and The Wild Party, receiving Tony nominations for her performances in the last two shows on that list. Kitt also starred in the London production of Stephen Sondheim's Follies and has appeared in many movies and television shows, including the 1960s Batman series.
Two other new cast members will join Nine on October 7: John Stamos will replace Antonio Banderas as Guido and Jenna Elfman will replace Jane Krakowski as Carla. Rebecca Luker recently joined the company as Claudia, replacing Laura Benanti.