Credit goes to Kate. Jessica Radloff gets The Nanny star, Fran Drescher, and her ex-husband, Peter Marc Jacobson, to sing the theme songs for The Nanny and Happily Divorced for Glamour.com as part of our Sing. Credit goes to Kate. Sing along with the cast as they sing the theme song to Happily Divorced! Tune in Wednesdays 10:30/9:30C only on TV Land! Jessica Radloff gets The Nanny star, Fran. Fran's appearance on Jay Leno on June 15, 2010. Fran was singing the theme song of The Nanny. This is for those who hasn't seen Fran Drescher on it :) Credit to The Fran Drescher German Homepage!