Emily Henry just revealed a royal family crossover that even the biggest #BookTok girlies never saw coming. Henry, 34, appeared on a recent episode of the "Bookmarked by Reese's Book Club" podcast alongside author and collaborator Yulin Kuang. While discussing the upcoming film adaptation of Henry's People We Meet on Vacation, the duo shared some behind-the-scenes secrets - including one about the female protagonist, Poppy.