I third Emily Giffin although skip her latest (The One and Only).
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This book was a piece of crap. Like, I was legit wtf'ing through the whole thing. Not what I wanted from my beach read.
I love Jennifer Weiner books, they're so funny and real. Little earthquakes is my favorite.
It was just a whole lot of ick and very, very disappointing, especially since I loved her other books. Something Blue is my favorite, closely followed by Something Borrowed and Where We Belong.
I like Jennifer Weiner, too.
I just thought of a few more, Liane Moriarty's Big Little Lies and The Husband's Secret as well as Kristin Hannah (I loved the Nightingale, but I pretty much love every book she has ever written starting with Once in Every Life, where a deaf woman from the modern times dies but is reincarnated as a post-Civil War housewife).