Revenge of the Bridesmaids (2010)

When Abigail and Parker return from New York City to visit their hometown, they discover that their best friend Rachel is a bridesmaid in the wedding of their childhood friend Caitlyn and Tony, who was Rachel's boyfriend until Caitlyn interfered. Abigail and Parker decide to run their own interference. They manipulative Caitlyn and become bridesmaids so that they and Rachel can sabotage the wedding from the inside. With help from a police detective who happens to be a groomsman, the girls strive to ruin Caitlyn's wedding while dodging her controlling mother and--hopefully--reuniting Tony and Rachel.