Have you read the confessions of georgia nicolson books?

I have seen the movie "angus,thongs,and perfect snogging" and i looooooooved it. so now i want to read the book series. i have heard that there is an english version and and american version. For those of you who have read the books, which version is better and what order do they come in? Also i have a younger cousin who would like to read them so i want to know what readers of the series would rate the books (PG, PG-13 etc....) thanks you guys