Queen of Babble Gets Hitched (Queen of Babble Series #3) Book

First off, let me say that I only read this book because the book club I'm trying to get into picked this as their read this month. I am only sticking with the bookclub after this book, because the person hosting sent out an email apology for how bad this book is. So I know I'm not going to be surrounded by women gushing about this stupid book.
Aaaagggggghhhh! Awful book. In the beginning I could only stand to read this one chapter at a time. As I got closer to the end, I read a big chunk at once, sort of like chugging something that tastes bad, so it'd be done sooner.
I detested Lizzie. What a hot mess! Chaz was more likable, but much less formed as a character. He seemed to exist only to be the object of Lizzie's lust/ hate/ confusion. (I say lust because I seriously don't think she was capable of loving, maybe other than her grandmother. When she thinks she's in love with Luke, she just gushes about how handsome and muscular he is. And when she's with Chaz, she talks about externals too.) Anyway, so I found no reason why Chaz would have liked her, much less loved her. She was an emotional wreck, incapable of realizing she didn't love someone she got engaged to anyway, or breaking it off, even when she realized she didn't love him, and she "loved" someone else, with whom she'd been sleeping for days/ weeks. I thought Lizzie was immature and selfish and undisciplined. Reading about her obsessive love of Diet Coke and junk food, and her resulting weight gain, and her embarrassment about it, resulting in fake stuff like Spanx and hiding her weight from her fiance...just wasn't enjoyable. I didn't like her. I didn't know why someone seemingly decent like Chaz would either. Or Luke, for that matter. then again, Chaz loves her, and his best friend is skeezy "perfect" Luke. so maybe he's not so nice as she likes to pretend he is either.
The book wasn't even subtle about ANY of this. From the first few pages, you know exactly where this is heading, but you still have to listen to endless repetitions/ variations on "Chaz and Lizzie, sitting in a tree, K-I-S-S-I-N-G" and Lizzie screaming "no, no I don't. Take it back, or I'll tell Mom" or something immature like that. It's obvious who she liked and where it was going. Luke was barely a character, just an additional foil for her neuroses.
Her sisters were detestable. Her grandmother was a hot mess too. Her sidekicks--Monique and Tiffany and the rest--are annoying at best, and very trashy. I hated the constant name brand dropping--it's tacky, and unnecessary, and totally dates a book. Ava was annoying too. And I was completely annoyed and offended by her portrayal of Valencia, who is presented as detestable, for apparent crimes like self-control in public, being smart and accomplished, beautiful, and well groomed. Petty females like Lizzie are the worst. I went to college. I behave in public. I prefer to look neat and organized in public. I guess I'm the Devil too, in Lizzie's book. If she's so dumb she doesn't even read books, really, that's her fault. Not anyone else's. Her insecurities, and her pettiness because of it, drove me batty!
I really didn't like a single thing about this book (The wedding gown business/ her job was only mildly interesting.) I do not understand, based on this book, how this author is as popular/ well-published of an author as she is. I certainly doubt I'll ever (willingly) read anything by her again.