Finished Once and For All by Sarah Dessen.
Louna’s mom is a wedding planner (one of the best, actually; certainly the best in the town). She’s helped out for basically ever, even though she’s become rather cynical about the whole thing (not as cynical as her mom and godfather are, though). And then she meets Ambrose.
There is a lot going on that I didn’t mention. Those few lines don’t even begin to really summarize this novel.
What you should know: it’s as good as anything Sarah Dessen has ever written and Louna may be my favorite heroine of hers.