What begins as passive-aggressive sabotage escalates into a full-scale "bride war." Liv dyes Emma’s hair blue (instead of the intended subtle highlights) and sabotages her tan. Emma retaliates by switching Liv’s wedding invitation list, sending her parents to a strip club, and spiking her weight-loss supplements with junk food.

Liv (Kate Hudson) and Emma (Anne Hathaway) have been best friends since childhood. They have spent twenty years planning every detail of their future weddings, all centered around one specific location: The Plaza Hotel in June. When both women get engaged within hours of each other, they excitedly head to New York’s most sought-after wedding planner, Marion St. Claire (Candice Bergen), to book their dates.

The film follows best friends Liv (Kate Hudson) and Emma (Anne Hathaway) from childhood to their late twenties in New York City. Both have a long-standing dream of a June wedding at the iconic Plaza Hotel. Without consulting each other, they both become engaged and immediately hire the city’s top wedding planner, Marion St. Claire (Candice Bergen).