The lady posted on her friends circle that she would go to your house on the first day of the new year and commented like this

Then you can just say welcome, or at least entertain me, just treat me as one more friend. I don’t know if you mean that you don’t want this young lady to come to your house. If so, then you can directly tell him that you are not free or something. If not, then just say welcome! I guarantee that you will have a good time eating and having fun