NO! The only legal bar is that she must not be a catholic. Diana wasn't a princess before she married Charles. It remains to be seen what would happen if the heir to the throne was gay and had a civil partnership.
if you marry a prince
Marry a prince, probably.
you have to marry a prince.
because if you marry a prince you become a princess because your husband is a prince
Prince Charles married camilla after Princess Diana died.
Depends if you are a beautiful princess.
She was bald
She married Prince Rainier of Monaco.
no, she was just a girl but since she was going to marry the prince she was the would be princess
Because he find a real princess like his mother princess diana.
Prince Charles and Princess Diana married ion July 29, 1981
It is possible that Princess Grace married a prince because he traveled in her social circles. She was most likely to meet and marry someone of similar background. Some people speculate that the marriage was entirely political.