Nate and Brooke are going to the same four weddings, four weekends in a row. To avoid set-ups, they go together as "wedding buddies." But what starts as a friendship soon deepens.

An overenthusiastic photographer wins her younger sister an all-expenses-paid wedding, which includes a trip to Beverly Hills to plan, and is surprised to learn that her ex-boyfriend is the best man and will be joining them.

When Jack, a groomsman, leaves for his best friend's wedding several states away, he's asked to pick up Samantha, a stranded bridesmaid. Jack discovers they've met before and have had a less than friendly past.