That was over 47 years ago in 1974.
Today she is 75, and has starred in 59 movies in total, 53 since The Godfather: Part II was released.
In The Godfather: Part II, I think Diane Keaton looks:
The Godfather: Part II scores 8.4 out of 10 on The Movie Database.
Diane Keaton's first acting role was as 'Joan Vecchio' in Lovers and Other Strangers, released in 1970 when she was 24.