John Travolta celebrates his daughter's 21st birthday with heartfelt message

John Travolta's daughter is all grown up! The actor shared a rare photo of his daughter Ella Travolta on Instagram to celebrate her 21st birthday.

“Happy 21st birthday to the most beautiful, kind, human being and artist I know. Your dad adores you!” he captioned the photo.

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The post comes over a month after Ella wished her dad a happy birthday over Instagram with a touching post.

"Happy Birthday to the most incredible man I have ever known," wrote Ella. "You are not only the best Dad ever, but you are also my best friend. Thank you for raising us, helping us, and loving us, and thank you for all of the good you do every day. The world is so lucky to have you, and so are we. I love you, Daddy. I had the best time celebrating your birthday with you yesterday."

The photo then features John, her, and her younger brother Benjamin.

The past year has been tough on the Travolta family, who lost their wife and mother Kelly Preston to breast cancer over the summer. These birthdays mark the first ones they've celebrated since Kelly passed at the age of 57.

The Grease star shared a tribute to his late wife a month after her death with a video of him and Ella dancing.

"My daughter @ella.travolta and I dancing in memory of momma," he captioned the post. "One of Kelly’s favorite things, dancing with me."

Ella also took to Instagram to share a heartfelt tribute to her mother after her death.

"I have never met anyone as courageous, strong, beautiful, and loving as you," she began. "Anyone who is lucky enough to have known you or to have ever been in your presence will agree that you have a glow and a light that never ceases to shine and that makes anyone around you feel instantly happy. Thank you for being there for me no matter what. Thank you for your love. Thank you for your help, and thank you for making this world a better place. You have made life so beautiful, and I know you will continue to do so always. I love you so much, mama."

Since then, the family has continued to share positive and fun posts on social media. John and Ella even experienced viral fame this year when the two appeared in a Super Bowl commercial for Scotts Miracle-Gro, which even included some familiar moves John did for Grease.