Her father, Julio Enrique Vergara Robayo, provides cattle to the meat industry.
Her father's family is Sephardi Jewish, while her mother is of mostly Ashkenazi Jewish, along with Spanish and Sephardi.
Actress Kat Dennings was born Katherine Victoria Litwack in Bryn Mawr, Pennsylvania, near Philadelphia, to Ellen Schatz , a speech therapist and poet, and Gerald Litwack, a molecular pharmacologist.
She is of British Isles, German, Polish, and Jewish ancestry.