Article continues below advertisementDiane Keaton's final Instagram post was her smiling alongside her dog, Reggie, in honor of National Pet Day. Six months before her tragic death, the legendary actress, who passed away in California, wrote on Instagram, "Proof our pets have great taste too! Happy National Pet Day from HG & @diane_keaton 🖤🐾."Article continues below advertisementSource: @diane_keaton/InstagramDiane Keaton posted with her dog in April. Article continues below advertisementArticle continues below advertisementSource: MEGADiane Keaton died at 79 years old.