Steve Martin has reacted to Father of the Bride costar Diane Keaton's death. "Loved!" Martin, 80, wrote via X on Saturday, October 11, alongside a black and white throwback photo of a young Keaton, whose death at age 79 was announced earlier that day. Martin also shared one of Keaton's famous quotes from her 1977 film Annie Hall: "La dee da, la dee da." Keaton died in California, a spokesperson for her family told People on Saturday. According to the outlet, no additional information about the actress' death is available at this time. Her family has "asked for privacy.