兒時好友Josh跟Molly搭機回芝加哥參加家人的婚禮,兩人沒細想便同意假裝訂婚,讓Josh臨終的爸爸開心一點。On a flight home to Chicago for a family wedding, childhood friends Josh and Molly innocently agree to fake a wedding engagement to make Josh's dying father happy. Things quickly get out of hand with their two boisterous families, and a series of events causes them to pretend to be a couple and start planning a phony wedding.