Baby Proof by Emily Giffin. I am a huge sucker for Emily Giffin books. They are fun, easy reads, but what I find most compelling about her writing is that whether or not you like the characters in her books they just so gosh-darn relate-able.
Never judge a book by its movie. Something Borrowed is a fantastic book, and the movie completely altered the story line. And right after you read this, go pick up Something Blue and every other book by Emily Giffin.