Question: Maria Christina Thayer is an American actress and comedian who was a guest star in what episode of the third season of the American television comedy series "30 Rock"?
Sentence (from "St. Valentine's Day (30 Rock)"): Guest stars in "St. Valentine's Day" include Marylouise Burke, Jon Hamm, Salma Hayek, Zak Orth, Laila Robins, Maria Thayer, and Allie Trimm.
Relevant evidence: Yes