Ann Morgan Guilbert (born October 16, 1928), sometimes credited as Ann Guilbert, is an American actress who played hyperactive neighbor Millie Helper in 61 episodes of the early 1960s sitcom The Dick Van Dyke Show, and later Yetta Rosenberg, Fran Fine’s doddering grandmother, in 56 episodes of the 1990s sitcom The Nanny. She began her career as a featured performer and singer in the Billy Barnes Revues of the 1950s and 1960s.Guilbert was born in Minneapolis, Minnesota, the daughter of Dr.