Goldie Hawn, Bette Midler pay tribute to Diane Keaton, their 'First Wives Club' costar

Goldie Hawn and Bette Midler are honoring the "brilliant" Diane Keaton.

After the Oscar winner's death at age 79 was confirmed on Oct. 11 by People and The New York Times, the actresses who starred alongside her in "The First Wives Club" both shared heartfelt tributes.

"Diane, we aren't ready to lose you," Hawn wrote on Instagram. "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 also reflected that Keaton "stole the hearts of the world and shared (her) genius with millions" and noted that she was "blessed" to work with her on "The First Wives Club." Hawn, Midler and Keaton starred in the 1996 comedy about women seeking revenge against their ex-husbands.

Hawn remembered their "days starting with coffee in the makeup trailer, laughing and joking, right through to the very last day of filming," calling it "a roller coaster of love."

"We agreed to grow old together, and one day, maybe live together with all our girlfriends," Hawn shared. "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."

In her own tribute, Midler remembered Keaton as "brilliant, beautiful" and "extraordinary."

"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!"

Keaton's death has sparked an outpouring of grief throughout the entertainment industry, drawing tributes from Jane Fonda, Steve Martin and more stars. Reese Witherspoon also shared an emotional tribute during her Hello Sunshine Shine Away event in Los Angeles.

"The thing I just loved about her is she was such an original," Witherspoon said. "If you just close your mind and think of Diane Keaton ... she is just incredible and indelible."

"Saturday Night Live" also honored Keaton by displaying a black-and-white photo of her near the end of the Oct. 11 episode, which aired hours after news broke of her death.

Contributing: Anthony Robledo and Pamela Avila