Gotham City comes to Riverdale, as series stars Camila Mendes, Lili Reinhart and Madeline Petsch -- who played Veronica Lodge, Betty Cooper and Cheryl Blossom on The CW series, respectively -- dress up as the Gotham City Sirens for Halloween.
Source：https://www.cbr.com/riverdale-gotham-city-sirens-halloween/
