There isn't much publicly known in terms of specific facts that prove 'The Prince and Me' is based on a true story. But the idea of a prince and an ordinary person coming together has some basis in reality. In history, there have been instances of commoners having relationships with royalty, whether it was through arranged marriages or by chance encounters. The movie might be taking this general concept and building a fictional story around it. It uses the elements of royalty, such as the pomp and circumstance, and the contrast with the simplicity of the commoner's life to create a story that feels like it could be based on real events.
The fact that it's based on a true story might come from the general premise of a common person and a royal figure interacting. There may not be one specific event that can be pointed out as proof, but the overall concept has roots in real - life scenarios where different social classes meet.
In 'The Prince and Me', what makes it seem based on a true story is the plausibility of the situation. It's not unheard of for someone from a non - royal background to cross paths with royalty. However, it's hard to pinpoint exact facts or events as proof. It could be that the creators were inspired by a collection of real - life encounters between commoners and royals throughout history. They then crafted a story that incorporated elements like cultural differences, the allure of royalty, and the challenges of a relationship between two very different individuals.