For someone who's hobby is crashing weddings and sleeping with vulnerable female guests, marriage isn't really an option. That is until Jeremy (Vince Vaughn) falls in love with Gloria (Isla Fisher). This crazy-about-each-other couple gets married in a big glamorous wedding that is picture perfect.
Except for the part where Jeremy's fellow wedding crasher/best friend, John (Owen Wilson), causes a scene by interrupting the ceremony and confessing his love to Gloria's engaged sister, Claire (Rachel McAdams). But, hey, if these two wild guys can be tamed, maybe there's hope for the rest of them.