Two 29-year-old women, Abigail Scanlon and Parker Wald, best friends since childhood, return to their small hometown of Lambert, Louisiana from New York City for a visit.[2] During a party to celebrate Parker's parents' wedding anniversary, they run into old friends. They learn that their close friend, Rachel, has lost the love of her life, Tony, to their ex-friend, Caitlyn, a conniving gold-digger who pretends to be pregnant to trick Tony into marrying her so that she can use his money to keep her family's estate.
Intent upon preventing a loveless marriage, Parker and Abigail go "undercover" as Caitlyn's bridesmaids to sabotage the wedding. Along the way, Caitlyn's tightly wound mother, Olivia, works hard to keep Abigail and Parker at bay as Parker falls for the town detective Henry Kent. The bridesmaids put their best-laid plans in motion only to see them go outrageously awry with Olivia interfering as much as possible. As a result, Abigail, Parker and Rachel are arrested by Henry, but Parker convinces him to release them. So Abigail, Parker, and Rachel sneak into the wedding and kidnap Caitlyn. They take her to the hospital for a pregnancy test and trick her into admitting the truth. At the wedding ceremony Tony lies to Caitlyn that his family lost their fortunes which leads to her canceling the wedding and storming off. After Caitlyn is gone, Tony gets on one knee and proposes to Rachel, also revealing that he lied and is still rich.
At the end of the film, Parker stars in a major action film with Henry at her side as her consultant, Rachel marries Tony, and Abigail sells her book on their antics as bridesmaids.
