本·墨菲（约翰·克劳辛斯基 John Krasinski 饰）和莎蒂·琼斯（曼蒂·穆尔 Mandy Moore 饰）是一对彼此深爱对方的情侣，他们的爱情充满浪漫和温馨，顺理成章两人也即将走入婚礼殿堂。莎蒂希望在与她的家族渊源颇深的圣•奥古斯汀教堂举行婚礼，但是这恐怕是一个糟糕的决定。这间教堂的弗兰克牧师（罗宾·威廉姆斯 Robin Williams 饰）看似和蔼可亲，却是个极为苛刻和奇怪的家伙。他对年轻男女贸然进入婚姻又选择逃避感到痛心疾首，因此弗兰克坚持任何一对来他的教堂举行婚礼的情侣都要接受婚前准备课程。未能通过该课程的情侣，弗兰克将有权取消婚礼。 　　看似只是例行的公事，却发现实行起来障碍重重。感情一向顺风顺水的本和莎蒂，将迎来走入教堂前的最大挑战……Sadie and Ben are in love, and although Ben suggests getting married in the Caribbean, Sadie has her heart set on a wedding at the family church, St. Augustine's. Ben says sure, and they meet with the pastor, Rev. Frank. The only date open for two years is three weeks away, and Frank insists the kids go through his marriage prep course. They're to write their own vows; he also demands chastity, bugs their apartment, initiates arguments, has them care for robot twins, creates friction between Ben and her family, and raises doubts in Sadie. Desperate, Ben looks for dirt on Frank. Can he undermine Frank's authority and keep Sadie's heart?