What about Ann Rutherford and Alicia Rhett? Both still alive.
http://simple.wikipedia.org/wiki/Olivia_de_Havilland
"Olivia Mary de Havilland (born July 1, 1916) is an English actress and is the only living star of Gone with the Wind, but there are also actors with smaller roles in said movie who are still alive."
Guess I missed that last part. I was just surprised Olivia is still kickin'.