- Is the granddaughter of Jimmy Braddock, the fighter, by Jimmy's daughter, Rosemarie. Rosemarie DeWitt had a supporting role in the film based on Jimmy's life, Cinderella Man (2005).
- (November 2, 2009) Married her boyfriend of 3 years Ron Livingston in San Francisco.
- Mother, with husband Ron Livingston, of adopted daughters Gracie James Livingston (b. April 29, 2013) and Esperanza Mae Livingston (b. December 2015).
- Met husband Ron Livingston on the set of Standoff (2006).
- Graduated from Whippany Park High School in Whippany, New Jersey, in 1989.
- Graduate of New College of Hofstra University with a degree in creative studies. Additional training at the Actors Center in New York.
- She has eight half-siblings from her father's previous marriage.
- Was a member of Alpha Phi sorority at Hofstra University.
- She has Irish and 1/8th German ancestry. Her German-American paternal great-grandfather was born under the surname "Witt", and the family surname later became "DeWitt".
- Won an OBIE for Small Tragedy at Playwright's Horizons.
- Born on exactly the same date as Anthony Rapp (of "Rent", "Far From Home", and "Adventures in Babysitting" fame).
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