Charles Spencer, 59 (AKA Princess Diana’s younger brother of almost three years), had an exciting announcement for his Instagram followers earlier this week. Along with a snap of a picturesque sunset, the 9th Earl Spencer included a caption with a major tidbit about his professional life: “Last light, last night - time to get some restorative energy after a day at my desk. Tomorrow I hand in the very final version of my new book. To be published in March.”