Young women whose marriage fantasies are less Kay Jewelers rings and Jessica McClintock gowns and more crown jewels and 700-year-old castles will eagerly be taking note of the fact that Prince Harry turns 25 next week, which means he comes into the millions from the estate of his late mother, Princess Diana. And since our own answer to Diana, Tinsley Mortimer, has managed to bag herself a prince, why not follow her example and set your sights on a husband in line to a throne? After the jump, our guide to the world's most appealing 20-something princes.