And cheering her on from home were her three daughters -- Rumer Willis, Scout Willis and Tallulah Willis -- whom she shares with ex Bruce Willis, as well as her 21-month-old granddaughter Lou.
"What a gift to witness you shine and be acknowledged not only for the incredible work you did in this film but in the multitude of staggeringly breathtaking work your entire career," Rumer, 36, wrote of her mother on her Instagram Stories. "This is just the beginning."
Related: Demi Moore's Family Celebrates Her First Golden Globes Win with Raucous Cheers -- See the Emotional Video!
Middle daughter Scout, 33, was just as thrilled, writing on her own Stories, "I am so beyond proud, my entire body is buzzing. I am so overwhelmed with joy and pride and gratitude!!"
And Tallulah, 30, also couldn't stop gushing over her mom, calling her the "greatest teacher."
"This woman is my teacher, my guide my friend," she wrote. "The world is seeing you as your family does, and I am beaming with pride."
Tallulah also shared the moment Moore realized she'd won the Globe, writing, "I love you mom. You are the greatest teacher. The genuine shock makes me tear up. You are so worthy."
Moore also got some love from Bruce's current wife Emma Heming Willis, who praised her on Instagram, writing, "We're screaming over here!!! Congratulations @demimoore!!!!!"
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The Willis sisters also shared a video capturing the moment Moore's name was called, prompting them to leap into the air screaming and cheering.
Moore herself was visibly stunned by the win, taking to the stage to deliver a heartfelt speech encompassing her decades in the entertainment industry.
"Oh wow. I really wasn't expecting that," she said while holding her Golden Globe. "I'm just in shock right now. I've been doing this a long time, like over 45 years, and this is the first time I've ever won anything as an actor. I'm just so humbled and so grateful."
Later in the evening, Rumer, Scout and Tallulah celebrated Moore's win in person. The sisters snapped a selfie with actor Glen Powell while also holding up their mom's Golden Globe for the camera.