Alicia trusts absolutely nobody, all she wants is to be the is center of attention, what's going to happen to her when she enters the real world?
Her cousin Nina probably won't fare much better. She's 13, has D-cups, and dresses and acts like a 25-year-old. She's a sexual predator's dream come true.
In the book where all of the PC go to Hollywood, there's talk of a star who may like Claire, and who also is "hooking up" with another female lead. Claire is 12, and the other two can't be much older or the gossip columns would be mentioning a significant age difference. Still, even if the two stars are 15, that's very young to be hooking up so casually, and way too old for Claire. This is the kind of thing I bought when I was 11, but now it's just Squicky. Also, in one of the one-clique-member vacation books, Alicia and her cousins are in Spain, and a bouncer lets her and her cousins in because he thinks they're hot. Alicia is 12, one of her cousins is 13 (and described in earlier books to dress like a 25-year-old and have D-cups) and the other two are 15. Great, now we've got full out ephebophilia (and this was something even 11-year-old me thought was gross).
Also Fridge Brilliance (should this go below?): The age of consent in Spain is 13. Make of that what you will.
Which leads to Fridge Horror as Massie is an implied sociopath, and probably won't get retribution for a good long time.
This series actually kind of works if you take it as an over-the-top Stealth Parody.
It also works if you see it as mildly depressing Truth in Television: Girls like the The Clique really do exist, and they almost never learn anything or suffer the consquences of what they've done.
All those older guys who are constantly mentioned as checking out the Pretty Committee aren't ephebophiles. In reality, they're just smiling with amusement at a bunch of 12 year olds who most likely look absolutely ridiculous. The girls just take it in a sexual way because they that think they're "all that." It may not be what the author was going for, but it certainly makes it easier to read.
The books, particularly the later ones, make it clear that Briarwood doesn't have uniforms. The Movie puts the Briarwood boys in formal school blazers and ties. They were probably setting things up so the girls' uniform design contest could be part of the school merger so that they could've gotten on with that plot without having to show 12-year-old girls in offensively Stripperiffic Halloween costumes.