Normally I wouldn't. Im not the prettiest person and I'm ok with that. My boyfriend tells me im the most beautiful person he knows. He says its because I have internal beauty not just external. When you love someone you also see the beauty and goodness in them. So yes I believe that to my boyfriend I am gorgeous ;) Also I trust that he tells the truth.
These response are depressing. If you are in a relationship and your SO calls you their queen then just except the compliment. It's a term of endearment meant to mean not only are you the only one he's interested in but you are one of his main priorities.