Paul Coleman (Jason Lee) is about to get married to his sweetheart Karen (Selma Blair), but when he wakes up next a strange girl named Becky (Julia Stiles) on the morning after his bachelor party things get interesting. Not only does he keep running in to this new girl, but he soon discovers that she is Karen's cousin. Paul isn't sure what his feelings are, but when Becky's ex-boyfriend has her followed and brings forward telling photographs of Paul and Becky together things get interesting. The two of them try to fix the problem and the situation only gets worse from there. Paul seems to have finally found what he is looking for, but is it Karen or Becky?
