no
No. You cannot marry Princess Peach. Because she would rather marry Mario. :) Sorry.
A princess has to marry a price before she can be a princess
He married princess Neihotpe
There are dozens of different princess Elizabeths. Many did marry Catholic men.
You can pretend you are a princess or you can marry someone who has the correct royal station to give you the title of Princess.
Marry a prince, probably.
if you marry a prince
you have to marry a prince.
she has to marry
Nicholas II married Alix, Princess von Hesse-Darmstadt. When she came to Russia she adopted the Russian version Aleksandra Feyordorovna. We know her today as Alexandra. (As her uncle Edward VII married his aunt Alexandra of Denmark, they were both cousins of George V of Great Britain.)
Alexandra Bellow actually did not have any siblings. He was an only child. However, he did marry five times before his passing.