Listen to the dialogue and you see a whole other movie
This movie is actually pretty interesting if you just watch how Marina's character gets her ire up listening to the Prince deprecate America and decides to do something about it. She skillfully uses her charms to captivate the young king, the Regent, and the Queen Dowager. She brings about reconciliation between a father and his son and moves their fictional country towards a Western alliance. She has the wisdom to tell the Regent that although she does love him, it is not quite the time for them to move forward with their relationship but assures him that she will be there for him when he is no longer involved in the politics and his son has assumed his full duties.
Besides all this, I am highly entertained by Marilyn's great timing with props, such as the footstool sliding to sit at the Regent's knee or her little impromptu song and dance.
I think Marilyn chose this movie to try and get credit for having acting ability and brains. Unfortunately, it is hard to control what the media will focus on and they seem to think stories about Olivier's frustration with Marilyn and the size of her bust were more interesting to the public.
This positively infantile preoccupation with bosoms!Terry-Thomas about US 1963.Hasnt changed much!