Annie (Kristen Wiig), is a maid of honor whose life unravels as she leads her best friend Lillian (Maya Rudolph) and a group of colorful bridesmaids (Rose Byrne, Melissa McCarthy, Wendi McLendon-Covey, and Ellie Kemper) on a wild ride down the path to matrimony. Annie's life is a mess, but when she finds out her lifetime best friend is engaged, she simply must serve as Lillian's maid of honor. Though lovelorn and broke, Annie bluffs her way through the expensive and bizarre rituals. With one chance to get it perfect, she'll show Lillian and her bridesmaids just how far a true friend will go for a friend.