When Carina, princess of Vineland, goes to L.A. to speak at a high school, little does she know that Julia Johnson -- who looks exactly like her -- is in the audience. Soon, Carina has switched places with Julia and is on her way to a Toadmuffin rock concert, while Julia is off to an embassy ball. But when Carina falls asleep on Toadmuffin's concert bus and winds up headed for Texas -- and Julia meets the dreamy Markus (whom Carina doesn't much like) and winds up headed back to Vineland -- things get royally mixed up! Thankfully, the girls' quick thinking sets things right, Julia's mom becomes the royal hat designer, and Julia gets her boy!