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I don't have anything against it on principle, if it's open from the start and she's not trying to fool anyone. That being said, if I remove the "crush on anime girl" aspect from the equation and see her as entertainment only, the fact that I know she's married probably means she's not all that entertaining to me in the first place.
I wouldn't find it really fun if in the middle of a book I'm reading the author just starts talking about her husband for a while.
If we're not here to have a pretend relationship, then keep it to yourself and deliver the content. I'm not interested in your personal life if I'm not supposed to feed the delusion that I'm a part of it.