Out at the Wedding (2007)

aka Impair au Mariage

After telling her fiancé, Dana, that her entire family is dead, Manhattanite Alex whisks off to her childhood home in South Carolina to serve as bridesmaid at her high-maintenance, estranged sister Jeannie's wedding. As she tries not to steal Jeannie's thunder by telling her family that a) she's engaged, and b) the man she's going to marry is a Jewish African American, things get a little mixed up.