Demi Moore all smiles with pregnant daughter Rumer Willis at doctor's appointment: 'Overjoyed for you'

Demi Moore is embracing her daughter's journey to motherhood and celebrating milestones along the way with her.

In an Instagram post on Wednesday, the actress and author shared a photo of her and her daughters at Rumer Willis' ultrasound appointment. Moore's daughters Tallulah Willis and Scout LaRue Willis are also in the photo and are all smiles as Rumer Willis shows off her baby bump.

"Saying hello to the little nibblet!!" Moore wrote in the caption. "It's an honor to witness your journey into motherhood, and can't wait to welcome this baby in to the world!"

Rumer Willis, 34, announced the news of her pregnancy Tuesday on Instagram, with a sweet photo of her baby bump. This will be her first baby with her boyfriend, musician Derek Richard Thomas.

Demi Moore and Bruce Willis are soon-to-be grandparents.

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Rumer Willis' baby will also be her parents, Moore and Bruce Willis' first grandchild.

Moore shared her daughter's photos yesterday on Instagram and wrote in the caption, "Entering my hot kooky unhinged grandma era."

Moore and Bruce Willis have three children together: Rumer Willis, Tallulah Willis and Scott LaRue Willis. Bruce Willis also has two daughters with his wife, Emma Heming Willis: 8-year-old Evelyn Penn and 10-year-old Mabel Ray.

Last week, Moore shared photos of their blended family celebrating the holidays together.

In November, Rumer Willis made her relationship with Thomas official by sharing photos of the both of them during a fall photoshoot.