Tilda Swinton is a performance artist.
The following is a list of Saturn Award nominees and winners for Best Supporting Actress ( in a film ) . Katherine Matilda `` Tilda '' Swinton ( born 5 November 1960 ) is a British actress , performance artist , model , and fashion muse , known for her roles in independent and Hollywood films . Swinton won the Volpi Cup for Best Actress at the Venice Film Festival for her performance as Isabella of France in Edward II ( 1991 ) . Swinton was nominated for a Golden Globe Award for her performance in The Deep End ( 2001 ) . Swinton won the Academy Award for Best Supporting Actress and the BAFTA Award for Best Actress in a Supporting Role for her performance as lawyer Karen Crowder in Michael Clayton ( 2007 ) .