American actress born in Philadelphia in 1929…

American actress born in Philadelphia in 1929. After modelling, television and stage work, she became a favourite leading lady of Alfred Hitchcock in Dial M for Murder, Rear Window and To Catch a Thief. She won the Academy Award for Best Actress for The Country Girl in 1955. The following year she retired from film to marry Prince Rainier III, becoming Princess of Monaco, and died in Monaco in 1982.

The answer in 10 letters