Amid the actor's battle with frontotemporal dementia (FTD), the 29-year-old shared a series of photos of the dad-and-daughter duo and expressed how much he means to her.
"Damn, these photos are hitting tonight," she wrote on Instagram Nov. 14. "You're my whole damn heart and I'm so proud to be your Tallulah Belle Bruce Willis. #babybruce#TBBW."
The pictures included a snapshot of Tallulah and Bruce sitting in a chair together and smiling as well as a photo of them outside—with her wearing a sweatshirt that featured the title of one of his movies, Die Hard. A throwback also depicted her dad grinning on stage while another image offered a close-up of her driver's license that showed one of her middle names is in honor of her father.
Tallulah—who Bruce shares with ex Demi Moore along with daughters Rumer Willis, 35, and Scout Willis, 32—and her family members—who also include his wife Emma Heming Willis and their children Mabel, 11, and Evelyn, 9—announced in February that the Armageddon star was diagnosed with FTD, noting his condition had progressed from his initial aphasia diagnosis that they had shared 10 months prior when they first informed fans he was stepping away from acting.
Since learning of his diagnosis, Tallulah and her loved ones have spoken openly about the impact the condition has had on not only Bruce but also on the entire family.
"I think it's twofold," she explained on a Nov. 8 episode of The Drew Barrymore Show. "I think on one hand, it's who we are as a family. But also, it's really important for us to spread awareness about FTD."
And Tallulah expressed the family's hope that by sharing their experience they'll be able to help others.
"If we can take something that we're struggling with as a family and individually," she continued, "to help other people, to turn it around, to make something beautiful about it, that's really special for us."
To see photos of the Willis family from over the years, keep reading.