They shared the screen—and forged lasting friendships.Leonardo DiCaprio and Kate Winslet at the 2016 Oscars.Credit: Jason Merritt/Getty ImagesThe GistCountless celebrities have formed friendships with co-stars while working together on set.Famous duos like Steve Martin and Martin Short and Jennifer Aniston and Courteney Cox first bonded while sharing the screen.Sophie Turner and Maisie Williams grew up together while filming Game of Thrones, bec…