Mia Farrow (b. 1945) was the guest star on The Muppets Valentine Show in 1974. During the show, Farrow mentions that she has two children and one more on the way, indicating that during the filming she was pregnant with her son Fletcher Farrow Previn (b. March 14, 1974.)
She appeared in Rosemary's Baby and the remake of The Omen. She was married first to Frank Sinatra and subsequently to André Previn, with whom she had three children. Farrow also adopted three children with Previn and two more with Woody Allen. Her sister, Prudence, the inspiration for the Beatles song "Dear Prudence," worked on the production of The Muppets Take Manhattan.