Rumer Willis, 34, happily shows off her baby bump as her little sister, Tallulah, 28, smiles beside her.

Bruce Willis and Demi Moore’s daughter, Rumer, 34, happily shows off the baby bump as her little sister, Tallulah, 28, smiles beside her.

Bruce Willis and Demi Moore’s daughter Rumer, 34, joyously showed off her burgeoning baby bump on Wednesday.

The showbiz legacy posted a black and white snapshot to Insta Stories that also included her little sister Tallulah, 28, beaming at her side.

As Rumer turned in profile to highlight her growing belly, Tallulah squatted down and playfully stuck out her tongue.

Baby joy: Bruce Willis and Demi Moore’s daughter Rumer, 34, joyously showed off her blossoming baby bump in a photo with her little sister, Tallulah, 28

The snap was accompanied by a lengthy caption promoting Shaklee Meology prenatal vitamin packs and supplements.

Rumer is expecting a baby with her boyfriend Derek Richard Thomas, whom she had been dating for months before they went Instagram official in November.

By December, Demi was gleefully announcing Rumer’s pregnancy on Instagram, joking that she herself was “entering my crazy, unhinged grandma era.”

In an Instagram post celebrating the New Year, Rumer confessed that she “still can’t believe I’m cooking a little person in my tummy right now.”

Parents-to-be: Rumer is expecting a baby with her boyfriend Derek Richard Thomas, whom she had been dating for months before they went Instagram official in November.

Parents-to-be: Rumer is expecting a baby with her boyfriend Derek Richard Thomas, whom she had been dating for months before they went Instagram official in November.

Grandma-to-be: Back in December, Demi gleefully announced Rumer's pregnancy on Instagram and joked that she herself was

Grandma-to-be: Back in December, Demi gleefully announced Rumer’s pregnancy on Instagram, joking that she herself was “entering my crazy, unhinged grandma era.”

The Once Upon a Time…in Hollywood actress shared: ‘I am deeply grateful for the incredible lessons and gifts that have come my way this year. I’m so thankful that this little soul chose me to have the privilege of being her mommy.’

As New Year’s Eve wore on, she treated her fans to a touching image of her boyfriend lovingly kissing her tummy.

“So grateful for everything this year has brought me,” she gushed. “My love @derekrichardthomas and this new soul who has chosen me.”

Rumer offered a welcome message to his next little bundle of joy: ‘Can’t wait to meet you little one. I already love you very much.

'I'm so grateful': In an Instagram post celebrating the New Year, Rumer confessed that she 'still can't believe I'm cooking a little person in my tummy right now'

‘I’m so grateful’: In an Instagram post celebrating the New Year, Rumer confessed that she ‘still can’t believe I’m cooking a little person in my tummy right now’

Message from your mom: Willis also shared a message for his pending baby of joy, and how

Message from your mom: Willis also shared a message for his pending baby boy, and how he “can’t wait to meet you little one.”

Demi and Bruce welcomed three daughters together: Rumer, Tallulah, and their middle daughter, Scout, 31, before divorcing in 2000.

Bruce. 67, he has since married model Emma Heming, 44, with whom he shares his two youngest daughters Mabel, 10, and Evelyn, eight.

The blended family has managed to establish a famous friendly relationship with each other, and they all rallied around Bruce last year when the longtime movie star retired from acting due to his battle with aphasia, a brain condition.

Former friends: Demi and Bruce welcomed three daughters together: Rumer, Tallulah and their middle daughter, Scout, 31;  are pictured with Tallulah

Former friends: Demi and Bruce welcomed three daughters together: Rumer, Tallulah and their middle daughter, Scout, 31; are pictured with Tallulah