Tess Coleman (Curtis) is a widowed psychiatrist juggling her job and family while planning her second marriage. She’s getting no help from her teenage daughter, Anna (Lohan), who disapproves of her mom’s wedding plans.

Anna is a rebellious rocker, who plays guitar in a garage band and would rather flirt with older boys than listen to her uptight mother. One night, while the warring mother and daughter are at a Chinese restaurant, their fighting is overheard by an elderly Chinese grandmother who curses their fortune cookie, so that they wake up the next morning in each other’s bodies.

An hysterical series of physical comedy routines show how Tess and Anna are forced to live in each other’s bodies for the day, which happens to be the day of Tess’s rehearsal dinner and Anna’s band audition for the House of Blues.

Anna (in Tess’s body) goes for a spin on the back of her boyfriend’s motorcycle, and gives her mom a makeover, and Tess (in Anna’s body) stands up to a high school teacher.