The legendary actress died in California at age 79 on Oct. 11, PEOPLE first reported

Kimberly Williams-Paisley; Diane Keaton; Bette Midler.Credit : Bruce Glikas/WireImage;Paul Morigi/Getty ;Jamie McCarthy/Getty

A number of celebrities shared touching tributes to the actress following the news of her death. PEOPLE confirmed on Saturday, Oct. 11, that the legendary actress — known for her roles in such beloved films as Father of the Bride, First Wives Club and Annie Hall — died in California. She was 79.

Former costars and friends honored Keaton with messages and memories on social media.

Among them, Bette Midler posted a black-and-white photo of her First Wives Club costar on Instagram as she reflected on her legacy. “The brilliant, beautiful, extraordinary Diane Keaton has died. I cannot tell you how unbearably sad this makes me,” she wrote. “She was hilarious, a complete original, and completely without guile, or any of the competitiveness one would have expected from such a star. What you saw was who she was…oh, la, lala!”

In a post on her Instagram, Kimberly Williams-Paisley, who starred as Keaton’s daughter in the Father of the Bride movies, shared photos of the pair sharing the screen. “Diane, working with you will always be one of the highlights of my life,” she wrote. “You are one of a kind, and it was thrilling to be in your orbit for a time. Thank you for your kindness, your generosity, your talent, and above all, your laughter. 🙏🏻🕊️💔❤️❤️❤️.”

Comedian Steve Martin, who played Keaton’s husband in Father of the Bride, paid tribute to Keaton by sharing a joke involving the pair. His Instagram post reshared Interview magazine’s post featuring an exchange between Keaton and Martin Short, which began with Short asking, “Who’s sexier, me or Steve Martin?” Keaton replied, “I mean, you’re both idiots.”

Martin then wrote in the caption of his tribute: “Don’t know who first posted this, but it sums up our delightful relationship with Diane.”

In a statement to PEOPLE, Mary Steenburgen said: “Diane was magic. There was no one, nor will there ever be, anyone like her. I loved her and felt blessed to be her friend. My love to her family. What a wonder she was!!!”

Diane Keaton in 2019.Rodin Eckenroth/WireImage

Rosie O’Donnell said Keaton’s death “breaks my heart” in a post on Instagram. “Love to her children- what style what grace – she will be missed #ripdianekeaton 😥💔,” she added.

Diane Kruger posted a smiling photo of Keaton wearing one of her signature hats and scarves with the simple caption: “💔.”

Lesley Ann Warren said in a statement to PEOPLE: “I had the absolute gift of working with the brilliant and magical Diane Keaton in Harry and Walter Go To New York! I loved her long before and long after. She was one of the icons of supreme artistry, massive talent and generosity of her enormous gifts. She will be deeply missed.”

Alongside a photo of Keaton in a stylish Gucci pantsuit and loafers, Elizabeth Perkins remembered the actress as “a national treasure.”

“Ms. Keaton, you were a national treasure, with style, grace, intelligence and immense talent. Thank you for being my modern heroine and showing a young actress what it meant to be gutsy, fully self-deprecating but assured and to always be open, questioning and brave,” Perkins wrote. “Complex, eccentric and so gifted, you owned it…and wow, did you set the bar. You will always be my Annie Hall. Gosh, this cuts deep.💔.”

Diane Keaton and Woody Allen in ‘Annie Hall’.Bettmann Archive

Several celebrities reacted to PEOPLE’s Instagram post announcing Keaton’s death, including Derek Hough, who wrote: “Heartbreaking 💔 That feels so unexpected.” Olivia Munn wrote, “💔💔💔💔💔,” and Lily Tomlin similarly commented, “💔.”

Luke Evans posted a photo of himself posing for a selfie with Keaton at an event as he remembered the star as “such a brilliant actor.”

“What a sad day,” he wrote. “Rest in peace #dianekeaton. Such a brilliant actor, a kind heart and full of graciousness with a shining independent spirit.”

Steve Martin and Diane Keaton in ‘Father of the Bride’ in 1991.Moviestore/Shutterstock

Keaton’s Book Club costar Candice Bergen remembered the actress in a statement to PEOPLE, saying, “This is a huge loss both personally and for all of us. Diane was a true artist — tremendously gifted and uniquely talented in so many disciplines, yet also modest and wonderfully eccentric. I will miss her terribly.”

Jane Fonda, who also starred in Book Club, shared on Instagram that “it’s hard to believe … or accept that Diane has passed,” before reflecting on what made Keaton so special.

“She was always a spark of life and light, constantly giggling at her own foibles, being limitlessly creative…in her acting, her wardrobe, her books, her friends, her homes, her library, her world view. Unique is what she was. And, though she didn’t know it or wouldn’t admit it, man she was a fine actress!” Fonda wrote.

Reacting to Keaton’s death on Instagram, Octavia Spencer said, “Today we lost a true original.”

“@diane_keaton wasn’t just an actress: she was a force. a woman who showed us that being yourself is the most powerful thing you can be,” she continued. “From Annie Hall to Something’s Gotta Give, she made every role unforgettable. But beyond the screen, she brought joy, laughter, and style that was all her own. Thank you, Diane, for reminding us that authenticity never goes out of fashion.”

Kate Hudson — whose mother, Goldie Hawn, costarred with Keaton in First Wives Club — shared a clip from the 1996 movie with the message: “We love you so much Diane ❤️🕊️.”

In her own emotional tribute to Keaton, Hawn said, “Diane, we aren’t ready to lose you.” Touching on the actress’ legacy, she wrote: “You’ve left us with a trail of fairy dust, filled with particles of light and memories beyond imagination. How do we say goodbye? What words can come to mind when your heart is broken? You 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.”

Hawn continued: “You stole the hearts of the world and shared your genius with millions, making films that made us laugh and cry in ways only you could. I was blessed to make First Wives Club with you, our days starting with coffee in the makeup trailer, laughing and joking, right through to the very last day of filming. It was a roller coaster of love.”

Diane Keaton in ‘The Godfather’ (1972).CBS via Getty Images

Hawn went on to share that the two “agreed to get old together” and “maybe live together with all our girlfriends.”

“Well, we never got to live together, but we did grow older together. Who knows… maybe in the next life. Shine your fairy dust up there, girlfriend. I’m going to miss the hell out of you,” she concluded.

Alongside a photo of herself mingling with Keaton at an event, Elizabeth Banks reflected on how the Family Stone star was “beloved in her industry.”

“Every one of us idolizes her,” she wrote. “Her influence on culture, fashion, art and women can’t be overstated. She was a delight. I am proud I have a career that allowed me to meet her and breathe her air.”

Diane Keaton.Bellocqimages/Bauer-Griffin/GC Images

Sarah Jessica Parker shared a similar sentiment in a statement to PEOPLE. “Diane Keaton has been a point of inspiration for countless actresses. I include myself among those who loved and admired her,” she wrote, before sharing personal recollections of the star.

“I was very privileged to witness her singular skill and talent on both First Wives Club and The Family Stone. I will cherish those memories on set as well her touching, delightful and perfectly own cinematic career. Which is a gorgeous legacy of an exquisite person,” she continued, adding, “She will be terribly missed.”

Michael Douglas posted a photo on Instagram of himself sharing a laugh with Keaton in their 2014 film And So It Goes. He remembered his late costar as “one of the greatest icons in our industry.”

“RIP to my friend Diane Keaton. A heartbreaking loss of one of the greatest icons in our industry,” he wrote in the caption. “I have so many fond memories of working with Diane on our film And So It Goes nearly twelve years ago. Sending my deepest condolences to the Keaton family during this difficult time.”

Diane Keaton in 2019.Matt Winkelmeyer/Getty Images for CinemaCon

Viola Davis expressed her disbelief over the loss of Keaton as she shared a clip of the actress singing. “No!! No!!! No!! God, not yet, NO!!!” she wrote, before putting into words her view of Keaton’s legacy.

“You defined womanhood. The pathos, humor, levity, your ever-present youthfulness and vulnerability — you tattooed your SOUL into every role, making it impossible to imagine anyone else inhabiting them. You were undeniably, unapologetically YOU!!!” Davis continued, adding, “Loved you. Man… rest well. God bless your family, and I know angels are flying you home. 💔💔💔.”

Keaton’s Because I Said So costar Mandy Moore shared that working with the Oscar winner — who played her character’s mom in the movie — was “an honor of a lifetime.”

“They say don’t meet your heros but I got to work with one of mine and even call her ‘mom’ for a few months. An honor of a lifetime,” Moore wrote on Instagram. “What an incandescent human Di is and was. I am so sad she’s gone for all the reasons but also because it felt like she’d be here forever, dazzling us with her talent and charm (and her style, c’mon)!!! One of the very best to ever do it. All my love to her children and loved ones.”

Diane Keaton in 2022. Amy Sussman/Getty Images

KaDee Strickland, who costarred with Keaton in 2003’s Something’s Gotta Give, shared a tribute recalling how the movie was one of her first acting jobs.

“SOMETHING’S GOTTA GIVE was one of my first jobs, and I was privileged to work opposite one of my greatest heroes. @diane_keaton wore the cape the entire time,” she remembered. “She was welcoming, kind, & so very focused. And, of course, so funny. An artist of the highest caliber.”

Director Paul Feig paid tribute to Keaton on X, writing, “I was so honored to call Diane Keaton a friend. She was an amazingly kind and creative person who also just happened to be a Hollywood legend. She has been taken from us far too soon. We will miss you, Diane.”

In a post on X, Ben Stiller remembered the late actress as “one of the greatest film actors ever. An icon of style, humor and comedy. Brilliant.”

He added: “What a person.”