The entertainment world is in mourning. Actress Diane Keaton has died at the age of 79. Her passing was confirmed by a spokesperson to People magazine on October 11. She leaves behind her two children, Dexter and Duke.

The news prompted an immediate and heartfelt outpouring from her costars and admirers. Keaton was celebrated for her iconic film roles and her unique, charming personality.

Mandy Moore, who played Keaton's daughter in the 2007 film "Because I Said So," led the tributes. She shared an emotional message on Instagram alongside a still from their movie. "They say don't meet your heroes, but I got to work with one of mine and even call her 'mom' for a few months," Moore wrote.

She described the experience as an honor. Moore called Keaton an "incandescent human" and expressed deep sadness at her passing. She noted Keaton's unparalleled talent and unique style.

Other famous colleagues shared similar sentiments. Kimberly Williams-Paisley, another on-screen daughter from "Father of the Bride," posted her own tribute. She said working with Keaton was a life highlight. Williams-Paisley thanked her for her kindness, generosity, and laughter.

Bette Midler, her costar in "The First Wives Club," also expressed profound sadness. Midler remembered Keaton as hilarious and completely original. She emphasized that Keaton was without guile or the competitiveness often found in Hollywood. According to the Associated Press, Keaton's career was defined by these authentic and beloved performances.

Her impact on comedy and film remains immense. From her Oscar-winning role in "Annie Hall" to modern romantic comedies, she carved a unique path. She will be remembered as much for her brilliant work as for her wonderful spirit.