The mother-of-one, 36, revealed she had separated from her long-term partner on her Instagram Stories, where she made the revelation in an Ask Me Anything "uncensored" post.
Responding to the question "Are you and Derek still a couple?", she broke the news to her fans. "Nope," she said. "I am single momming it and co-parenting."
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Despite her recent heartbreak, Rumer exuded confidence as she attended the star-studded soirée at Hangar Nicelli in Venice, Italy.
Rumer Willis arrives at the amfAR Gala Venezia 2024 Presented By Red Sea International Film Festival And World Gold Council
Her mesmerizing dress featured a fitted corset that cinched her waist, along with a billowing cape and swathes of rich brown fabric draped across her hips before cascading into a rippling skirt.
Rumer's platinum blonde hair couldn't be more different from her mom's famous raven locks in color, but in length, the mother-daughter duo both sport waist-length locks.
For makeup, the Once Upon A Time In Hollywood actress rocked an edgy smokey eye and nude lips to draw attention to her striking features.
Photo shared by Demi Moore on Instagram of her daughter Rumer Willis with daughter Louetta while attending the Sun Valley Music Festival in Idaho, August 6, 2024
In a recent Instagram post, she referred to her mini-me as "my soulmate and the love of my life," adding: "The last year has been so wild and challenging and beautiful and you are such a light. I am so grateful for you. For your tenderness and love. I learned so much this year. So much about myself."
Bruce Willis with daughter Rumer and granddaughter Louetta in a photo shared on Instagram
She continued: "I feel more free and happier than I have been in a long time. Navigating through this last year has shown me strength inside myself I didn’t know was possible and I am so proud of myself."
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