Did you hear this one? Rumors are circulating that an adaptation of Candace Bushnell’s prequel novels to Sex and the CityThe Carrie Diaries and Summer in the City–are in the works. No, the prequel won’t star the original ladies as heavily CGI-ed versions of themselves but rather some of Hollywood’s young starlets of the moment: Blake Lively as Samantha, Elizabeth Olsen as Carrie, Emma Roberts as Miranda, and Selena Gomez as Charlotte.

Hold up. Mexican-American Selena Gomez will play ultimate WASP Charlotte York?

This may just be a casting rumor, but it does raise some timeless questions about the representation of race and ethnicity in Hollywood. Here are some examples from classic and recent cinema of actors taking on roles outside their race or ethnicity.