Bruce Willis and Demi Moore are about to take on new roles: grandparents. The former couple’s eldest daughter, Rumer Willis, took to Instagram Tuesday to share the happy news in an announcement the whole family took part in. The younger Willis, 34, and boyfriend Derek Richard Thomas shared some black-and-white photos of the Vista Kicks singer kissing the expectant mother’s belly. Willis quickly received support from her mom, 60, as well as sisters Scout, 31, and Tallulah, 28. The trio all shared the same posts, with variations on the “Ghost” star’s caption: “Entering my hot kooky unhinged gran…
