22 of the most iconic on-screen prom dresses, from 'Pretty in Pink' to 'Grease'
Buena Vista Pictures; Erika Doss/Prime Video; Summit Entertainment Julia Stiles as Kat Stratford in '10 Things I Hate About You,' 1999; Christopher Briney as Conrad and Lola Tung as Belly on 'The Summer I Turned Pretty'; Kristen Stewart …