As the daughter of Fisher and the granddaughter of Reynolds, Lourd was certainly deeply affected by the passing of both women.
The Scream Queens star took to Instagram on Monday to respond to the kind words and prayers of her fanbase.
"There are no words to express how much I will miss my Abadaba and my one and only Momby. Your love and support means the world to me," Lourd wrote to her fans in her first time speaking publicly of the deaths.
With the post, the 24 year old actress included a family photo of her as a child with her recently deceased loved ones, who were both entertainment icons of their time.
Due to Reynolds's declining health over the past year, the trio's last public appearance together was at the 2015 Screen Actors Guild Awards, where Fisher presented her mom with the Life Achievement Award.
Lourd, herself, accepted another award on her grandmother's behalf in November 2015: the Jean Hersholt Humanitarian Award from the Academy of Motion Picture Arts and Sciences, which was awarded to Reynolds in honor of her passion for mental health charities throughout her career.
"It honestly feels super-weird to be up here without her because she's always been the leader of our family," Lourd said while accepting the award. "I've truly never seen her miss a show in her life. But unfortunately, our leader needed a little backup tonight, so I'm here to thank the Academy and all of you in this room for this truly incredible honor."
Carrie Fisher and Debbie Reynolds will be sorely missed by many, including their daughter and granddaughter, but the young Billie Lourd is sure to feel the love and support from her many fans as she continues to heal from her tragic losses.