Two best friends become rivals when they schedule their respective weddings on the same day.

Marion St. Claire: It was quite a wedding and as I stood there watching I realized something I'd forgotten a long time ago. Sometimes in life there really are bonds formed that can never be broken. Sometimes you really can find that one person who will stand by you no matter what. Maybe you will find it in a spouse and celebrate it with your dream wedding. But there's also the chance that the one person you can count on for a lifetime, the one person who knows you sometimes better than you know yourself is the same person who's been standing beside you all along.
Daniel: They haven't spoken in a week. That's like a century in girl years.
[from trailer]
Emma: [to Liv] Your wedding's gonna be huge, just like your ass at prom.
Liv: Your wedding can suck it.
Marion St. Claire: A wedding marks the first day of the rest of your life. You have been dead until now. Were you aware of that? You're dead right now.
Emma: I understand.
Marion St. Claire: Angela, for example, will die dead.
Liv: If I were your wedding, I'd be sleeping with one eye open...
Bridal Store Attendant: You do not alter a Vera to fit you, you alter yourself to fit Vera.
Liv: [watching Emma dance with her brother]
Daniel: Let it happen on its own.
Liv: Did I make a huge mistake and marry someone smarter than me?
[they smile at each other and kisses]