Diane Keaton, the Oscar-winning star of Annie Hall, The Godfather films and Father of the Bride, has died aged 79.
People Magazine reported on Saturday US time that she died in California with loved ones, citing a family spokesperson.
Keaton, who appeared in more than 60 films, including The Godfather trilogy, The First Wives Club and eight films with Woody Allen, stood out in Hollywood with a personal style that favoured androgynous looks, turtleneck sweaters and her trademark hats.
She earned Oscar nominations for best actress for her portrayal of US journalist Louise Bryant in the 1981 political drama Reds, as a caring aunt to Leonardo DiCaprio in the 1996 family saga Marvin's Room and opposite Jack Nicholson in the 2003 romantic comedy Something's Gotta Give.
Hollywood pays tribute to 'icon'
The unexpected news of her passing was met with shock around the world.
"She was hilarious, a complete original, and completely without guile, or any of the competitiveness one would have expected from such a star," Bette Midler said in a post on Instagram.
She and Keaton co-starred in The First Wives Club.
Jane Fonda, who also starred in the "Book Club" franchise, remembered Keaton as "a spark of life and light, constantly giggling at her own foibles."
"Unique is what she was," Fonda wrote on Instagram. "And, though she didn't know it or wouldn't admit it, man she was a fine actress!"
Their "First Wives Club" costar Goldie Hawn emotionally wrote, "Diane, we aren't ready to lose you."
She remembered that Keaton "never liked praise, so humble, but now you can't tell me to 'shut up' honey. There was, and will be, no one like you. ... I'm going to miss the hell out of you."
Meanwhile, Martin, who played her husband, shared a snippet from an Interview magazine article where Martin Short asked her who was sexier, to which Keaton replied, "I mean, you're both idiots."
"Don't know who first posted this, but it sums up our delightful relationship with Diane," Martin wrote on Instagram.
Keaton is survived by her two children, Dexter and Duke.
