Demi Moore is celebrating the pregnancy of her first daughter, Rumer Willis.

On Tuesday, the 60-year-old celebrity took to Instagram to mark the special milestone in their family's life, especially her eldest daughter's. She posted a series of photos featuring Rumer and her baby bump, and some of the snaps also show the 34-year-old singer's partner, Derek Richard Thomas.

In the caption, Moore wrote, "Entering my hot kooky unhinged grandma era," alongside a seedling emoji.

The post has amassed more than 126,000 likes, with over 1,300 comments. Many netizens appeared to have congratulated the "St. Elmo's Fire" actress and the rest of the family for the pregnancy news.

People, in its report covering the social media update, noted that the post comes after Rumer Willis and Derek Richard Thomas made a joint announcement, revealing their first pregnancy together on the same platform earlier that day. The photos they shared on social media are the same snaps Demi Moore used in her own post.

The magazine said the first photo shows Thomas wrapping his hand around Willis' growing baby bump as he kisses her belly. As for the last shot, the couple gives similar poses as the first snap.

Meanwhile, the second image features a silhouette of the "House Bunny" actress as she stands near a window.

Following the pregnancy announcement, People shared in a separate report that Rumer Willis and Derek Richard Thomas have been together since earlier this year. It also noted that their baby will be the first grandchild of her parents, Bruce Willis and Demi Moore.

The “What Lies Ahead” actress is the eldest daughter of the former couple, who were married from 1987 to 2000. They also share two more daughters, Scout and Tallulah, who are now 31 and 28 years of age.

To date, the “Sixth Sense” star is with Emma Heming Willis, whom he married in 2009. They also share two daughters, who are ages eight and ten.

Elsewhere in the report from People, published Tuesday, it said that apart from Demi Moore, Bruce Willis’ current wife, Emma Heming Willis, also shared a similar post on Instagram to celebrate the pregnancy news.

Using two of the three photos Rumer Willis and Derek Richard Thomas first posted earlier that day, Emma congratulated the couple for the relationship milestone.

In the caption, she wrote, “Baby news is happy news!!! Congratulations @rumerwillis and @derekrichardthomas,” before adding, “We are elated over here,” alongside a hatching chick emoji.