"(It's) more akin to my love for elephants, Dorothy Dunnett's books, good female detective novels, Pride & Prejudice, coffee, Foyle's War, crisp apples," she wrote in a follow-up tweet.
Having both grown up in the public eye -- Clinton as a teenager in the White House and Fiona as a social media star from the moment of her birth -- the pair will have a lot to talk about when they meet.
Or -- well -- they would, if Fiona could speak English.
Clinton will be in Cincinnati Oct. 15 to sign copies of her new book, "Start Now! You Can Make a Difference," at Joseph-Beth Booksellers. Anyone interested in attending the event can buy tickets online.