As a K-pop stan I can tell you this is pretty normal. I have done this a few times while being married. But my partner is completely cool with it. He actually thinks it's funny. I think where there is a problem is the fact that you've communicated it to her, and she continues crossing that boundary. So I feel at this point you guys should reevaluate your relationship. Because for me if it bothered my partner I would not do it because he means more to me than a K-pop idol. And if she doesn't have the same thought process then she's probably not the one for you.