- Her paternal grandfather, Desmond FitzGerald, was the deputy director of the CIA during the Kennedy administration.
- Has been in a relationship with Aidan Turner since they worked together on The Man that Killed Hitler and then the Bigfoot.
- Studied Shakespeare at the Royal Academy of Dramatic Art in London.
- Raised in Camden, Maine.
- Her aunt is Pulitzer Prize-winning journalist Frances FitzGerald.
- Her mother, Pam Allen, is a popular knitwear designer, author and knitting magazine editor. Caitlin modeled for several of her books. When Pam was the editor in chief of "Interweave Knits" magazine in the early 2000s, Caitlin was the featured model in most of the issues.
- Sister of Ryan Fitzgerald and half-sister of Alexander and Cooper Fitzgerald from her father's marriage to actress Lucinda Ziesing.
- Her father, Des FitzGerald, is the former CEO of the multinational corporation ContiGroup and the founder of Ducktrap River Fish Farm Inc. Her mother, Pam Allen, is the author of Knitting for Dummies and the founder of the yarn company Quince & Co.
- Graduated from NYU's Tisch School of the Arts, where she studied drama at the Stella Adler Studio of Acting.
- First developed an interest in acting as a child and performed in many community theatre and school productions.
- Parents are Des FitzGerald and Pam Allen. They divorced when she was a child.
- Was a boarding student at Concord Academy in Massachusetts.
- Mother, with husband Aidan Turner, of one son (b. January 2022).
- In August 2020, she married her boyfriend of 3 years Aidan Turner.
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