Rumer Willis is "incredibly proud" of her sister Tallulah for reaching three years of sobriety.

Rumer Willis

Rumer Willis

The 23-year-old actress took to Instagram on Friday (07.07.17) to share with her followers that she had reached the impressive milestone after having previously feeling like a "malnourished string bean" who did not "value" her life or body during her battle with addiction and anorexia.

Now, her older sister Rumer, 28, has left a heart-warming comment on Tallulah's post, dubbing her sobriety as a "beautiful transformation".

Rumer wrote: "My beautiful Tallulah Belle

"I am so incredibly proud of you. Of your strength, your courage, your grace through all of uncomfortable moments and your commitment to yourself. 3 years clean and sober is a massive achievement! The woman I have seen you become in the last 3 years has me in awe of you. You inspire me everyday. The way you have learned to love and accept all parts of yourself that you used to hide away is one of the most beautiful transformations I have had the honor to witness.

"I love you more than words can say my incredible baby sister (sic)"

The 'Bandits' actress - who is the daughter of Demi Moore and her ex-husband Bruce Willis - gave up alcohol and in 2015 and threw a party to celebrate a year of sobriety.

Sharing a throwback picture of herself with a cigarette in her mouth and a can beer looking extremely skinny, Tallulah captioned her post on Instagram: "3 years ago I was a malnourished string bean with aches that echoed throughout my soul. However the internal cries to tend my most blistered and deep wounds repeatedly fell on deaf ears. I did not value myself, my life or my body and as such I was constantly punishing for not being enough. Self annihilation fueled with medicating left me a shell, and the world on mute. I was hoisted from my hole, (one so deep I was certain we were nearing the Earths magma core) on the backs of powerful human beings that I will forever be indebted too, and on that day my life was gifted back to me. I love the girl in this picture, I cry for her and I mourn her lost years. She is inside of me always and I must never let her slip too far. I don't push any agenda, I can only speak for my path and staying sober has been far and beyond the most important thing I've done in my wee 23 years. (sic)"