Lunched with Emerald [Cunard] to meet Mrs Simpson, the maîtresse-en-titre of the Prince of Wales. She is a nice, quiet, well-bred, mouse of a woman with large startled eyes and a huge, huge mole. We had a luncheon party here. The plot was to do a politesse to Mrs Simpson. She is a jolly, plain, intelligent, quiet little woman, both unpretentious and unprepossessing. But, as I wrote to [Prince] Paul of Yugoslavia today, she has already the air of a personage and walks into the room as if she almost expected to be curtsied to: at least she would not be surprised. She has complete power ...