Stephanie Anne Birkitt (born January 7, 1975) is a former assistant to David Letterman on Late Show with David Letterman. Although Birkitt was usually treated as a character named Vicki, in some of her appearances, Letterman referred to her by various other surreal nicknames such as Smitty, Kitty, Monty, Gunter, and Dutch. She and Letterman were involved in a sexual relationship.