- Was among over 80 women who accused Harvey Weinstein of sexual harassment or assault in October 2017.
- Older sister of Portia Doubleday.
- Kaitlin, her mother Christina Hart, father Frank Doubleday, and sister Portia Doubleday, are all members of the Screen Actors Guild.
- Has a son, Franklin Lucien (b. February 2019), with her husband Devin Lucien.
- (May 6, 2016) Married her longtime boyfriend Devin Lucien in an outdoor ceremony in Big Sur, California following a year-long engagement.
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