The 12-year-old is ushering in a new era, with spiky hair to boot.

We may receive a portion of sales if you purchase a product through a link in this article. With the heat dialed down and layering season almost in full swing, hair is officially part of the outfit.

“French girl hair” has long been a subject of admiration worldwide, from the tousled Bardot blonde of the ’70s to the revival of Jane Birkin’s iconic bangs. We can’t forget the French bob, either, ...