The Prince of Hearts (1997)

The Queen's youngest son is off to university, mainly because "I'm hopeless at anything else". Barry, his new bodyguard, has no time for the royal family and left school at fifteen. He certainly didn't volunteer for this job, and is damned if he's going to enjoy it. Yet he can't help liking the hopelessly unworldly young prince, at least, until they both set their eyes on the new American student!