Diane Keaton's daughter, Dexter, is honoring the late actress on what would have been her 80th her birthday. "I miss you, mom 💔🕊️Thank you @winterstone for my forever reminder of my wonderful mom 🖤🤍🖤," Dexter, 30, captioned a post via Instagram on Monday, January 5, showing off a new tattoo to celebrate Keaton's legacy. One picture showed Dexter's tattoo up close, which said, "La Di Da" with a small heart, a reference to the actress' famous line in 1977's Annie Hall. Diane's son, Duke, 26, was also tagged in the photo, showing off his own commemorative tattoo that said, "Weird Old World." The post also featured a photo of Keaton and Dexter wrapping their arms around each other from behind while taking in a view of the water. In her Instagram Stories, Dexter shared that she got a black and white polka-dot manicure, the color scheme her mother was known for sporting. "Happy heavenly birthday, momma," she wrote alongside the photo of her nails on Monday, nearly three months after the late actress' death. Diane Keaton's Health Reportedly 'Declined Very Suddenly' in Last Few Months Keaton died on October 11, 2025, at age 79, with a spokesperson telling People, "Her family has asked for privacy in this moment of great sadness." Days later, her cause of death was confirmed to be primary bacterial pneumonia, with no other significant contributing factors listed. "The Keaton family are very grateful for the extraordinary messages of love and support they have received these past few days on behalf of their beloved Diane, who passed away from pneumonia on October 11," her family said in a statement to People at the time. "She loved her animals and she was steadfast in her support of the unhoused community, so any donations in her memory to a local food bank or an animal shelter would be a wonderful and much appreciated tribute to her," their statement continued. Bacterial pneumonia occurs when "the lungs are infected with bacteria, particularly the small air sacs in the lungs that bring in oxygen and get it moving into the bloodstream, referred to as the alveoli," Dr. Emma Lin, a board-certified pulmonologist and sleep medicine specialist who did not treat Keaton, told Us Weekly that month, adding "bacterial pneumonia differs from viral in its onset, which occurs quickly" and "individuals can rapidly move from healthy to extremely ill in no time." Keaton was remembered for her versatile acting career, which included roles in The Godfather, Father of the Bride, The First Wives Club and more, by her costars and friends, including Goldie Hawn. "I happened to learn when I was in my backyard, and I went over to my backyard to my rose garden," Hawn, 80, said at The Hollywood Reporter's Women in Entertainment Gala last month after finding out about Keaton's death. "I just looked down. She can't be gone. She just cannot be gone. No one like that should ever die. She just brought so much joy, so much life, so much exuberance. She was like lightning in a bottle." With tears in her eyes, Hawn remembered Keaton as an "extraordinary human being" and "amazing actress." "Look at this natural aspect of how her body and mind work together and how she's able to bring us joy and give us emotion and all of it," Hawn continued. "But look what else she did. She wrote books. She was interested in many things, not just acting and producing, but also directing."