John Beckwith and Jeremy Grey are divorce mediators and best friends who are living and working in Washington, D.C. John and Jeremy have a ritual that they look forward to every spring - crashing weddings. The duo create elaborate identities and backstories in case other guests ask them how they are acquainted with the bridal couple. John and Jeremy infilitrate themselves into the wedding reception by dancing with the flower girls, blowing up balloons for small children, getting down on the dance floor and schmoozing with the relatives. The duo's main goal is to hook up with attractive females at the reception, a feat that they somehow always manage to accomplish.

When Jeremy reads in the paper that influential politician Treasury Secretary William Cleary is hosting the ritzy wedding of his daughter, he decides that this elaborate wedding will be the piece de resistance of their wedding crashing season. Although John is initially reluctant, he is swept away by Jeremy's enthusiasm. Due to the heightened security, both men know that they have to be at the top of their game to pull it off. At the church John lays eyes on the Senator's beautiful daughter Claire, who is a bridesmaid, and he feels an immediate attraction. Likewise, Jeremy spots the Senator's youngest daughter, Gloria, and tells John that he has "dibs" on her. At the reception both Jeremy and John go after the two women and try to get close to them. When Jeremy has sex with a besotted Gloria at the reception he is startled when she immediately starts acting like a crazed stalker.