Billie Lourd lamented that she could not celebrate her late mother, Carrie Fisher, on what would have been her 68th birthday Monday.
Fisher, famous for her portrayal of Star Wars' Princess Leia, died in 2016.
"Some years my grief makes me feel the warmth of her love, some years it makes me angry, some years I feel numb but today when I woke up I just felt sad," she added. "I didn't want to celebrate, I just wanted my mom."
Lourd, who is also an actress, posted a photo of Fisher blowing out candles on a chocolate cake, with Lourd looking on, smiling.
She wrote that her grief "bodysnatched" her Monday, causing her to Google search the average age of death for women."Google said it was 80.2," she said. "My mom died when she was 60."
Lourd also discussed addiction in her post.
"And same goes for those of us affected by that struggle," she added.