天生一对

Nick Parker and Elizabeth James met and married each other during an ocean cruise on the QE2. Elizabeth gave birth to twin daughters Hallie and Annie (both played by Lohan), but the couple divorced and lost contact with each other, each parent raising one of the twins without telling her about her sister. Nick raised Hallie in the Napa Valley and became a wealthy wine grower, while Elizabeth raised Annie in London and became a famous wedding gown designer.

After the ocean cruise and onboard wedding ceremony, the story jumps ahead to a summer in which Nick and Elizabeth coincidentally enroll their daughters in the same summer camp. Annie and Hallie, who are now eleven years old, first meet at the end of a fencing match, when they remove their masks and see that they look alike. A comical hostility between the two girls leads to a prank war that ends when the camp counselors fall into one of Hallie's traps and isolate the twins from the other girls.

安妮和荷莉两个小女孩在夏令营中相识。她们相貌惊人的相似，却非常合不来。十分偶然的，她们知道了对方原来是自己的孪生姐妹。 她们开始互相打听对方的生活，讨论自己的父母：他们在一个豪华的航海轮船上相遇，在旅途中就结了婚。然而最后却以感情破裂收场。因为这场离异，双胞胎姐妹一个被爸爸尼克带到加州，生活在一个美丽的葡萄园；一个则被当婚纱设计师的妈妈丽莎带到伦敦。两人因此从未谋面，甚至不知道彼此的存在。 得知了这个真相，两个调皮的小鬼开始谋划她们的计策：她们决定调换身份，到对方的家庭去生活，一切都进展顺利。直到父亲要再婚，对后母的一场疯狂狙击大战开始了……