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.
Because he find a real princess like his mother princess diana.
no, she was just a girl but since she was going to marry the prince she was the would be princess
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.