Rumer Willis is a mum. And yes, Bruce Willis and Demi Moore are now grandparents

(From left) Emma Heming, Rumer Willis, Tallulah Willis, Bruce Willis and Scout Willis in a photo taken on July 14, 2018 in Los Angeles. Photo: TNS

Rumer Willis has welcomed a baby girl, making her celebrity parents, Demi Moore and Bruce Willis, first-time grandparents.

The Once Upon A Time ... in Hollywood and Empire actor announced the baby's arrival with her boyfriend, indie musician Derek Richard Thomas.