A Guy Thing 2003

The morning after his wild bachelor party, Paul wakes up and finds a beautiful, strange woman, named Becky, sleeping soundly in his bed. He soon discovers that Becky is his fiancee's cousin. Since Paul can't remember much about the night before, he naturally assumes the worst--that he's cheated on his adoring fiancee, Karen. And so, the guilt-ridden Paul spends the week before his wedding, scrambling to cover up his supposed infidelity.