- Father was a Mormon missionary in France, where he met and converted Mireille's mother.
- Won an Irene Ryan Acting Scholarship while attending Brigham Young University.
- Performed with the New York acting troupe Handcart Ensemble.
- Played identical twins Kathy and Jodean Marquart on the HBO drama Big Love.
- Was five months pregnant while shooting the pilot for AMC crime drama The Killing.
- Prepped for her detective role in The Killing by grilling the series' still photographer, who had spent 20 years as a homicide investigator.
- Holds a black belt in tae kwon do.
- 2005, Tony — Actress (Featured Role--Play): Nominee
- 2012, Golden Globe — Best Performance by an Actress in a Television Series - Drama: Nominee
- 2011, Emmy — Outstanding Lead Actress in a Drama Series: Nominee
- Sam Ruck — Stepson
- Raphael Enos — Brother
- Monique Enos — Mother
- Alan Ruck — Husband
- Vesper Vivianne Ruck — Daughter
- Emma Ruck — Stepdaughter
- Veronique Enos — Sister
- Jongiorgi Enos — Brother
- Larkin Zouey Ruck — Son
- Ginger Enos — Sister
- Attended Brigham Young University, Provo, Utah, United States