Acctualy I'm bit hesitant too, I don't like novel with stories of being actresses / famous in the film or music industry. But I'll Try.
The first few volumes are exactly what you're looking for. Spoiler: If you like it and read a few volumes come back for this. As of the latest volume I believe there is a possibility of a harem but it looks more to move along the plot than a desire to build a harem. I mean that as it's a political motive for nobles in the country and showing different factions and their reactions.