Rumer Willis sister Tululah birthday

Tallulah Willis turned 18 yesterday, and Bruce Willis and Demi Moore's youngest daughter celebrated her birthday at her father's new Beverly Hills mansion last night. We snapped Rumer arriving around 8pm, but there was no sign of Demi (or ex-hubby Ashton Kutcher).

A photographer tells X17online exclusively, "A bunch of Tallulah's friends came, along with her sisters and her dad Bruce, but we were waiting and waiting to see if Demi would show up — like hiding in the back of a car or something — and she never did."

Guests at Tallulah's b-day bash enjoyed catering from an organic food company, and while the music got pretty loud, things died down by 11pm. Sounds pretty standard for an 18-year-old's bash, right?