Yowza! Rumer Willis stepped out yesterday sporting a huge change from her naturally dark brown hair. It took seven hours to get her hair this blonde.

You might think the change is due to a to-dye-for role, but it's actually because of one, Rumer tells People: "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."

It's a very Marilyn Monroe blonde, but do you think it works on Rumer?