The most popular girls at school photographed by Lauren Greenfield

“This picture was taken in 1998, at a time when people were just beginning to realise what “mean girls” were, and how brutal and cliquey and excluding they could be. I was on an assignment for the New York Times magazine, for a special issue about being 13. They sent me to a place in Minnesota called Edina, right in the heartland of the US. It was so interesting: in a book I did called Fast Forward, I had been taking a look at how kids grow up really quickly in Los Angeles. But in Minnesota, where life is supposedly not as fast-paced as in LA, I found kids who were equally precocious.

This group of girls were in the popular clique at their school. Popularity was very codified: all the kids knew you had to shop in three particular stores, and that you needed to be blond, thin and blue-eyed. The girls were on their way to their first big party of the seventh grade. I spent a lot of time inside one of their houses, photographing them doing their makeup and combing their hair. Then we came outside. In the beautiful late-afternoon light, they lined up and started posing – it was very much their idea rather than mine.