Billie Lourd honors mom Carrie Fisher on her birthday with ice cream, Coke and Tom Petty

Carrie Fisher may be gone, but her daughter, Billie Lourd, is making sure she'll never be forgotten.

The 27-year-old took to Instagram Monday to pay a musical tribute to her mother on what would have been the "Star Wars" icon's 63rd birthday. Fisher died in 2016 after suffering a heart attack on a flight from London to Los Angeles.

According to Lourd, the best way to honor her mom, remembered by many for her sharp wit and charismatic personality, is to celebrate what she loved.

"Today would have been my Momby’s 63rd birthday," Lourd wrote. "Not that I’m some kind of grief expert by any means, but on milestones (or whatever you want to call them) like this, I like to celebrate her by doing things that she loved to do.

"So here’s a little video of me singing one of her favorite songs (American girl by Tom petty) in one of her favorite places (her bathtub of course)," she continued.

In the video, Lourd, accompanied by two guitarists, sings an acoustic version of the Petty classic while sitting in her mom's bathtub.

More:'Star Wars' icon Carrie Fisher dies at 60

More:Heroin, cocaine found in Carrie Fisher's system; Billie Lourd reacts

Lourd added she also has an idea for how to top off the celebration of her mom's life.

"I’ll probably have a pint of vanilla Haggen Dazs and a Coca Cola for dinner," she wrote, adding a heart emoji.

The full video of Lourd singing is on IGTV.

Celebs who have worked with Fisher and Lourd took to the comments to support the "Scream Queens" actress and honor her mom's memory.

"#AlwaysWithUs," wrote Fisher's "Star Wars" co-star Mark Hamill.

"just perfectly beautiful," Lourd's "American Horror Story" co-star Cheyenne Jackson commented. "Like you, honey."

"Amazing, Billie," wrote Bravo TV personality Andy Cohen.

More:Carrie Fisher was a mental health hero. Her advocacy was as important as her acting.