 Dr. Tess Coleman (Jamie Lee Curtis) and her fifteen-year-old daughter, Anna (Lindsay Lohan), are not getting along. They don t see eye-to-eye on clothes, hair, music, and certainly not in each other s taste in men. One Thursday evening, their disagreements reach a fever pitch - Anna is incensed that her mother doesn t support her musical aspirations and Tess, a widow about to remarry, can t see why Anna won t give her fiance (Mark Harmon) a break. Everything soon changes when two identical Chinese fortune cookies cause a little mystic mayhem. The next morning, their Friday gets freaky when Tess and Anna find themselves inside the wrong bodies. As they literally walk a mile in each other s shoes, they gain a little newfound respect for the other s point of view. But with Tess s wedding coming on Saturday, the two have to find a way to switch back - and fast.