Billie Lourd is paying tribute to her late mom, Carrie Fisher, on Mother's Day.
The actress took to Instagram on Sunday to share a heartfelt throwback snapshot of her and her mother on a train when Lourd was just a toddler.
WATCH: Billie Lourd Wears Princess Leia Dress to Pay Tribute to Late Mother Carrie Fisher at 'Star Wars' Celebration
The 24-year-old Scream Queens star captioned the super sweet flashback photo with a simple heart emoji.
This is Lourd's first Mother's Day without Fisher, who died in December, several days after undergoing cardiac arrest.
Lourd also lost her grandmother, Oscar winner Debbie Reynolds, who died of a stroke one day after Fisher died.
Earlier this month, the actress shared another touching throwback photo of her and her mother in celebration of Star Wars Day. The sweet photo showed Fisher holding her little girl in her arms as they walked alongside Chewbacca.
WATCH: A Look Back on Carrie Fisher and Billie Lourd's Cutest On-Camera Moments
In January, just two weeks after her mom's death, Lourd shared a heartfelt family photo of her and Fisher riding in the back of a limo. Lourd wrote in the caption, "Finding the funny might take a while but I learned from the best and her voice will forever be in my head and in my heart."
Check out the video below to see the emotional tribute.