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How the stylish, fairytale NYC of ‘Katy Keene’ came to life

Watch out, Midge Maisel and Blair Waldorf — NYC’s got a new TV fashion queen. “Katy Keene,” whose eponymous star is played by Lucy Hale from “Pretty Little Liars,” is the CW’s new spinoff of its twisted teen hit, “Riverdale.” The splashy drama, which premiered Thursday, is inspired by a retro “Archie” comic-book series of the same name, and follows a group of twentysomething creatives in New York City. “The New York of ‘Katy Keene’ is the New York of the imagination,” Michael Grassi, who co-created the show with Roberto Aguirre-Sacasa, tells The Post. “It sort of references the New York that we saw in our favorite movies and TV shows growing up — like ‘A Chorus Line’ or ‘Working Girl’ or ‘B ...