Board Thread:General Discussion/@comment-184.155.191.147-20130127002725/@comment-2111018-20130202005136

Since everyone thinks Charming is a prince, when he married Snow it just made things official since he's now a real prince by marriage. Snow was already a princess so marrying Charming does squat social ladder wise. However, since both of their real parents are dead and Charming's king "father" is dethroned and Coo-coo Queen Regina is dethroned, Snow and Charming are the sole rulers of their respective kingdoms. Said kingdoms are now joined since Snow and Charming are married and they are now King and Queen.

So yes A Spy in the Mirror, Snow is a queen and Charming a King through marriage.