Is the books like 'A Tale of Two Pretties' and 'These Boots Are Made for Stalking' along with The Clique Serie?

I know that there's The Clique, Best Friends for Never, Revenge of The Wannabes, Invasion of the Boy Snatchers, The Pretty Committee Strikes Back, Dial L for Loser, It's Not Easy Being Mean, Sealed With a Diss, Bratfest at Tiffany's, P.S. I Loathe You, and Boys 'R' Us. But for some reason there are more novels??? Any explanations?