TALLULAH Willis is engaged to her director boyfriend Dillon Buss after one year of dating.
The 27-year-old leaped into Dillon's arms after he got down on one knee in a sweet backyard proposal on Tuesday.
- who is the daughter of and - shared a slew of heartwarming photos from the special moment.
They showed her covering her mouth in shock as Dillon presented a ring, before the emotional couple hugged and kissed.
She captioned the post: "With absolute most certainty."
She also shared a close-up video of her giant diamond ring, writing: "HANDS STILL SHAKIN' — MOMS SPAGHETTI — I'm FIANCÉNCHED."
The ring - boasting an emerald-cut stone set on a yellow gold band - was made by Brooklyn-based jeweler Karina Noel.
Dillon also enthused about the relationship milestone on Instagram, sharing a sweet photo of the couple hugging.
He wrote: "I can finally call you my fiancée. Love you forever Buuski Lu, you are my best friend #maythefourthbewithus."
Tallulah's sisters were equally excited as they celebrated the engagement with a pool day afterwards.
, 29, said: "I’m so buoyed by this JOYOUS LOVE CELEBRATION!!!! HIP HIP HURRAY!!!!! @buuski@dillonbuss
"Today is a blessing because of your love! 5/4/21. Welcome the first official WILLIS BROTHER."
, 32, added: "Love these crazy kids."
"Congratulations @dillonbuss and @buuski I love you both so immensely and I am so excited for you."
It's unclear how long Tallulah and Dillon have been dating, although they first made an appearance together on Instagram in February 2020.
Last August, she wrote about how Dillon comforted her when she was having "flare-ups" of body dysmorphia, disassociation and obsessive compulsive disorder on a tough day.
"I texted my partner I was having an off day and needed some alone time, he told me he understood and was here to hold whatever space he could," she wrote on Instagram.
"Forty minutes later, the door creaked open and there he was with a picnic basket carrying my favorite snacks and drinkies.'
"We sat outside and talked about our first kisses. I felt today, the word 'grateful' become unspooled and reframed. I knew what it was, I never knew it could be felt to this magnitude."
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Tallulah has been open about her mental health struggles in the past.
She previously while battling "severe depression" and almost died from alcohol poisoning when she was 15.
Back in November, she said and that trolls' comments about her weight have been "triggering" as she used to have an eating disorder.
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In March, Tallulah said she was living with between the ages of 18 and 20.