Diane Keaton’s longtime pal Carole Bayer Sager was shocked by how frail the actress looked the last time they saw each other.

“I saw her two or three weeks ago,” the songwriter told People. “She had lost so much weight.”

Sager, who co-wrote Keaton’s single “First Christmas,” shared that she hadn’t seen as much of Keaton this year because the “Baby Boom” actress had been spending time in Palm Springs following the California wildfires in January.

“She had to go to Palm Springs because her house had been damaged inside, and they had to clean everything,” Sager explained. “She was down there for a while, and when she came back, I was kind of stunned by how much weight she’d lost.”

Despite this, the “A Groovy Kind of Love” composer said Keaton was “a magic light for everyone.”

“I just loved her. She was so special, she just lit up a room with her energy. She was happy and upbeat and taking photographs of everything she saw. She was completely creative; she never stopped creating.”

Sager also remembered working on “First Christmas,” which was released in November 2024.

“She so loved recording this song,” Sager recalled. “She was almost childlike about it. She was so authentic when she sang it, I mean, she just sang it like she was singing it, and she was sort of acting it, you know, because she is a great actress. And then she’d start to cry when she was singing it. But she did such a beautiful job.”

Keaton and Sager were part of a weekly “movie group” that also included Keaton’s “First Wives Club” co-star Bette Midler.

Midler remembered Keaton on social media over the weekend.

“The brilliant, beautiful, extraordinary Diane Keaton has died,” the “Beaches” star wrote alongside a photo of the late actress. “I cannot tell you how unbearably sad this makes me. 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 was announced on Saturday. She was 79.

No cause of death has been disclosed yet, but her health reportedly declined rapidly over the last few months.