I have read all the other Clique books, but this one was by far my favorite. I read this in one day, because once you get into it, you just can't put it down. I'll tell you a bit about it, but if you haven't read the others, i strongly suggest you start from the beginning.
Alicia's beautiful cousin Nina from Spain spends the semester at OCD, and all the boys LOVE her. She dresses in revealing, sexy outfits, and has alot of boy experience. Massie, Alicia, and Claire despise her because she's a show-off, and has kicked Massie out of the number one spot at OCD (Octavian Country Day School). Kristen and Dylan like her because she will give a pair of stylish boots to whichever girl wins a bet. I'm not going to tell you why Nina is really evil, you have to read the book for that.
I reccomend the whole Clique series to people who are too young to read "The It Girl". They have similar concepts, but that book is for older teens. However, there are curses in these books and phrases like "sluto-rita". Kids under ten or eleven should not be reading this. Anyway, it's a good book, but you should buy the next book, or even the whole series, because you will want to know what happens next, I guarantee that!