- Gave birth to her 1st child at age 43, a son named Phineas Davidson on October 11, 2009. Child's father is her third husband, Jeremy Davidson.
- Gave birth to her 4th child at age 46, a son in October 2012. Child's father is her 3rd husband, Jeremy Davidson.
- Gave birth to twins (her 2nd and 3rd children) at age 45, a son named Wilder Davidson & a daughter named Clio Davidson in August 2011. Children's father is her 3rd husband, Jeremy Davidson.
- Daughter of writer/director/actor Peter Masterson and actress Carlin Glynn.
- Mary Stuart's first significant on-screen line in The Stepford Wives (1975) was "Daddy, I just saw a man carrying a naked lady."
- Learned to smoke at age 18 for her role as Danni in Heaven Help Us (1985). It took her over 20 years to quit the habit.
- Was nominated for Broadway's 2003 Tony Award as Best Actress (Featured Role - Musical) for a revival of "Nine The Musical."
- Listed as one of twelve "Promising New Actors of 1987" in John Willis' Screen World, Vol. 39.
- She has received an Outer Critics' Circle Award nomination (2003) for Best Supporting Actress in the new revival of the Broadway musical "Nine".
- Sister-in-law of Jennifer Tost.
- She has received a Drama Desk Award nomination (2003) for Best Supporting Actress in the new revival of the Broadway musical "Nine".
- Sister of actress Alexandra Masterson and actor Peter Masterson.
- Theatre World Award winner for her performance in the 2003 production of the Broadway musical "Nine".
- Gave an interview in the 1980s in which she admitted to being a serious basketball fan.
- Born on the same date as John Cusack.
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