A vice inspector for the Paris police takes special interest in the plight of drug-addicted Lucky whom he considers to be more victim than criminal.

距离圣诞节还有一周，美丽的蒙特纳罗女公爵玛格丽特与长相跟自己一模一样的芝加哥平民史黛西对换了身份。在圣诞老人助手的魔法下，玛格丽特爱上了史黛西英俊的同事，而史黛西则爱上了玛格丽特的未婚夫，一位风度翩翩的王子。

　　A vice inspector for the Paris police takes special interest in the plight of drug-addicted Lucky whom he considers to be more victim than criminal.