ABOVE: Hayden Panettiere admires BFF Rumer Willis' new look.
Showing off the 'do Thursday, the 19-year-old daughter of Demi Moore and Bruce Willis and stepfather Ashton Kutcher told people that her new look jolted her folks, as well as her younger siblings, Scout, 16, and Tallulah, 13.
"I came home, and my parents were really shocked when I walked in the house," Rumer Willis says. "My sisters looked at me like, 'What? Your hair!' But everyone, including my parents, loved it."
What a relief. The makeover by Tracey Cunningham at the Neil George Salon in Beverly Hills required seven hours to complete.
"Honestly, it just took a long time. I got there at like 1 [p.m.], and I didn't leave until 8. I have really dark hair, so it took a long time, but it didn't hurt," she says.
"I got the idea because the movie I just finished, I was wearing a blonde wig, so I saw myself like that. And I just went for it."
The movie comedy, I Know What Boys Like, was previously called House Bunny. It features an almost nude Rumer Willis in dunce cap, among other stuff.
Says Rumer Willis: "I always find that whenever I'm doing something big in my life, I want to change the hair." We totally agree.