Moynahan was born in Binghamton, NY, the daughter of Mary Bridget (née Moriarty) and Edward Bradley Moynahan. She grew up in Longmeadow, MA, along with her two brothers, Andrew and Sean, she is the middle child. Moynahan attended Longmeadow High School and graduated in 1989. In high school, she was active in school athletics, participating in field hockey, basketball and lacrosse.

In 1999 she had her first big role (in a guest appearance) as Natasha in the TV series Sex and the City. Her breakthrough role in a feature film was as Rachel in Coyote Ugly a year later. Since then she has appeared on a number of blockbuster movies, such as The Sum of All Fears, The Recruit, I, Robot, and Lord of War. She studied acting at the Caymicheal Patten Studio in New York City.

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She dated NFL quarterback Tom Brady from 2004 until late 2006; Later, on February 18, 2007, Moynahan confirmed to People magazine that she was more than three months pregnant and that Brady was the father. She gave birth to a baby boy, John Edward Thomas Moynahan. at Saint John's Health Center in Santa Monica on August 22, 2007. Moynahan introduced her son to the world in an OK! Magazine photo spread. Read more...