It was a family affair last night (August 3) at Ashton Kutcher’s debut of his latest flick.

Joined by wife Demi Moore and stepdaughter Rumer Willis, the 31-year-old actor attended the premiere of Spread at the ArcLight Theater in Hollywood.

The sexy comedy — which costars Anne Heche and Margarita Levieva – centers on a serial womanizer and his jilted lover.

Meanwhile, sources say Demi will legally take Ashton’s last name as an anniversary present to her husband of four years.

“Demi didn’t want to change her name at first because it didn’t seem right but now she finally feels ready,” an insider tells British tabloid The People.