Kathryn Bridget Moynahan (born April 28, 1971 is an American actress and model. Moynahan is known for her role in the police drama Blue Bloods. She graduated from Longmeadow High School in Massachusetts in 1989, and began pursuing a career in modeling. She appeared in department-store catalogs and magazines, and after doing television commercials, she began taking acting lessons. Moynahan made her television debut in a guest appearance in the comedy series Sex and the City in 1999, where she later had a recurring role as Natasha.