Princess Protection Program (2009)

When a tiny country is invaded by a dictator, a young princess (later known as Rosie) is taken into custody by the Princess Protection Program. She is whisked away to rural Louisiana where she must learn the ins and outs of behaving like a normal American teenager. In the process of adapting to her new life, Rosie gives her new friend and roommate, Carter, a few lessons in how to act with royal aplomb.