The premise of the film is that Stacy, an owner of a sweets shop who will be competing in a royal baking competition, and Lady Margaret Dellacourt, Duchess of Montenaro, meet and realize they have an uncanny resemblance.
Lady Margaret is about to marry Prince Edward but wants to know what it’s like to be a normal girl, and when Stacy hears her plan, she has a hard time turning it down. Who doesn’t want to live like royalty for a day?
They will switch for two days, Lady Margaret putting on an American accent and Stacy trying to sound British, as they try their hand at living in each other’s lives.
The results are not what they had hoped for. The trailer shows Margaret burning toast and Stacy falling off the side of a horse. But it seems they soon get used to the other girl’s life and come to love the people in it.