Here are some other books that I think you may like:
The It Girl (series) by Cecily von Ziegesar.
Jenny Humphrey, kicked out of Constance Ballard prep school for being a bad influence, decides she'll do anything to become one of the popular girls at Waverly Academy. (from School Library Journal review).
Private (series) by Kate Brian.
Fifteen-year-old Reed Brennan wins a scholarship to Easton Academy -- the golden ticket away from her pill-popping mother and run-of-the-mill suburban life. But when she arrives on the beautiful, tradition-steeped campus of Easton, everyone is just a bit more sophisticated, a bit more gorgeous, and a lot wealthier than she ever thought possible. Reed realizes that even though she has been accepted to Easton, Easton has not accepted her. She feels like she's on the outside, looking in.
The Au Pairs (series) by Melissa de la Cruz.
Designer labels and movie star names fall like hailstones in this trendy story of three girls spending a summer in the Hamptons, taking care of a superwealthy couple's kids. Actually, Eliza was once rich herself--until her father got busted for illegal financial activities. Forced to move to Buffalo, she's eager to be back on the scene, though she's afraid people will learn she's a worker not a player. Jacqui, from Brazil, hopes to reunite with the love of her life, and Mara is a hard worker from Sturbridge who doesn't know her Gucci from her Pucci. (from Booklist review)
The Ashleys : There’s a New Name in School (The Ashleys series) by Melissa de la Cruz.
The Ashleys rule Miss Gamble's Preparatory School for Girls. They are gorgeous, rich, impeccably fashion forward, and, yes, all named Ashley. Lauren Page has gone to the same school with them her whole life, and the Ashleys, if forced to remember, might recall only a faint memory of shoving mud in the poor girl's mouth in kindergarten. But Lauren Page is no longer the mud-eating loser she once was. And though she has completely changed her exterior from bargain-basement cast-offs to off-the-runway couture (props, of course, to her new personal shopper) she is still the same person on the inside. And that person has had enough of the current regime. Look out, Ashleys. There's a new name in school.
The Luxe (first in series) by Melissa Godberson.
In Manhattan in 1899, five teens of different social classes lead dangerously scandalous lives, despite the strict rules of society and the best-laid plans of parents and others.
Sloppy Firsts (first in trilogy) by Megan McCaferty.
When her best friend, Hope, moves away from Pineville, New Jersey, 16-year-old Jessica Darling is devastated. Jessica is a fish out of water at school, a stranger at home, and now -- with the only person with whom she could really communicate gone -- more lost than ever. How is she supposed to deal with the boy-and-shopping-crazy girls at school, her dad's obsession with her track meets, and her nonexistent love life?
Airhead by Meg Cabot.
Sixteen-year-old Emerson Watts, an advanced placement student with a disdain for fashion, is the recipient of a "whole body transplant" and finds herself transformed into one of the world's most famous teen supermodels.
Secrets of My Hollywood Life (first in series) by Jen Calonita.
Longing to experience the life of a "normal" teenager, sixteen-year-old actress Kaitlin Burke assumes a false identity to attend a local high school.