In the "vulnerable" video, Lourd remembers her mother by performing one of Fisher's favorite songs at the piano the late actress was given by her own father.
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"It has been two years since my Momby's death and I still don't know what the 'right' thing to do on a death anniversary is (I'm sure a lot of you feel the same way about your loved ones)," she captioned the video. "So I decided to do something a little vulnerable for me, but something we both loved to do together - sing. This is the piano her father gave her and this was one of her favorite songs."
Lourd added that the lyrics to Jackson Browne's "These Days" were especially poignant for her in the aftermath of her mother's death.
"As the song says, we must 'keep on moving.' I've found that what keeps me moving is doing things that make me happy, working hard on the things that I'm passionate about and surrounding myself with people I love and making them smile," she continued. "I hope this encourages anyone feeling a little low or lost to 'keep on moving.' As my Momby once said, 'take your broken heart and turn it into art' - whatever that art may be for you."
After posting the tribute, Lourd's comments were filled with messages from her famous friends and fans.
"We all miss her... everyday. Thinking of you [heart emoji] your space uncle, mh," wrote "Star Wars" costar Mark Hamill. Fellow "Last Jedi" alum Laura Dern added, "Love You so."
"I am constantly in awe of your raw beauty and talent," wrote Frances Bean Cobain. "You are grace and light and the brightest gift your mama ever gave to the world. Love you to the moon and back sweet friend."
Lily Collins said the tribute was "so so beautiful," thanking Billie for "being brave to share it," while Olivia Wilde wrote, "You are a gift to the universe. Sending you all my love today and every day."
Lourd's "American Horror Story" family also commented on the post. Cody Fern left a series of heart emojis, Cheyenne Jackson said he "couldn't love you more if I tried" and Leslie Grossman said she was "so glad you did this." She added, "And you always make me smile. Love you Bills."
Fisher passed away two years ago at the age of 60, after suffering cardiac arrest. Fisher's mother and Lourd's grandmother, Debbie Reynolds, died the next day at the age of 84.