Olivia de Havilland was a French-British-American actress.
She is best known for her part in Gone with the Wind (1939).
However, I remember her most fondly for her part in the psychological horror movie Hush…Hush, Sweet Charlotte (1964). In that film she is the evil Miriam Deering.
Above is the scene in Hush … Hush in which Olivia and Bette Davis get rid of the supposedly dead body.