Kathryn Bridget Moynahan (born April 28, 1971) is an American actress and model. Moynahan is best known for her role as Erin Reagan 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. She made her feature-film debut in Coyote Ugly (2000). She had supporting roles in Serendipity (2001), The Sum of All Fears (2002), The Recruit (2003), I, Robot (2004), Lord of War (2005), Grey Matters (2006), Prey (2007), Noise (2007), Ramona and Beezus (2010), John Wick (2014), The Journey Home (2014), and John Wick: Chapter 2 (2017). She starred in the ABC television series Six Degrees, which premiered in September 2006. However, it was taken off the schedule after just eight episodes aired. Since September 2010, Moynahan has starred as an assistant district attorney in the CBS drama Blue Bloods. Early life Kathryn Bridget Moynahan was born April 28, 1971, in Binghamton, New York. She is the daughter of Irish Americans Mary Bridget (née Moriarty), a former school teacher, and Edward Bradley Moynahan, a scientist and former administrator at the University of Massachusetts Amherst. Moynahan has an older brother, Andy, and a younger brother, Sean, who work as a computer programmer and potter, respectively. When Moynahan was around seven years old, her family moved to Longmeadow, Massachusetts, where she later attended Longmeadow High School, and was captain of the girls' soccer, basketball, and lacrosse teams, graduating in 1989. She has said that during her childhood, she was a "tomboy". Career Early work After graduating from high school, Moynahan pursued a modeling career despite admitting she had never read fashion magazines growing up. She had accompanied a friend to a modeling audition in Springfield, Massachusetts, and was signed by the modeling agency instead of her friend. She began her career appearing in department-store catalogs in Springfield, during which time she attended the University of Massachusetts Amherst. Moynahan moved to New York City at age 18, and a year later, began appearing in magazines such as Vogue and Elle, and on covers of other widely known magazines. Her cover highlights include Vogue