Jane Krakowski ( \ / krəˈkoʊvski \ / ; born October 11 , 1968 ) is an American actress and singer who is best known for her role as Jenna Maroney on the NBC sitcom 30 Rock , for which she received four Primetime Emmy Award nominations for Outstanding Supporting Actress in a Comedy Series , and for her performance as Elaine Vassal on Ally McBeal , for which she was nominated for a Golden Globe Award .
She is best known for her performance as Elaine Vassal on Ally McBeal , for which she was nominated for a Golden Globe Award , and for her current role as Jenna Maroney on the NBC sitcom 30 Rock , for which she has been nominated for three Emmy Awards .