Ketubah mother's names

I am trying to fill out the names on the ketubah and realized I'm not sure if the mothers of the bride and groom should be listed with their maiden names or married names. I've searched the internet and have seen it both ways, my fiance is Jewish but he doesn't know either. Anyone have any experience either way? We are an interfaith couple, non-traditional ceremony and with a modern ketubah design w/Hebrew and English text. Thank you for any help!