Los Angeles-born Keaton shot to fame through her role as Kay Adams-Corleone in the Godfather films, before going on to feature in movies like Father of the Bride and Fellow First Wives Club.
Godfather director Francis Ford Coppola, like fellow US filmmaker Allen, also paid tribute to the “extraordinary” actress over the weekend.
In a post shared on social media, Coppola said: “Words can’t express the wonder and talent of Diane Keaton. Endlessly intelligent, so beautiful.
“From her earliest performances in Hair and throughout her amazing career, she was an extraordinary actor.”
He continued: “I saw her in the film Lovers and Other Strangers and knew I had to have her play Kay in The Godfather, (which she told me she based on my wife Ellie) and her wonderful work in Annie Hall, while simultaneously setting a new fashion trend.
“Everything about Diane was creativity personified.”