How about Royal Side-chick?!
Congrats to her. She really moved up in this world just by having sex with another person.
See, now youre thinking.
This or that? Isnt that always how they phrase these things? They tell you that there are only two answers to corral you away from other possibilities.
Royal side chick is good but too direct and factual, kinda flyover American. Its gotta have some pomp and floofiness to be British.
Im leaning toward “The Imperial Boinkity McSchwing”.