Although she had a baby boy only a few months before our photo shoot, Charlotte Casiraghi, who is a champion equestrian, looked slim and relaxed as she slipped into a Gucci gown. For 28, her manner was surprisingly serious, and, in fact, she may be more comfortable as a journalist than as an object of interest. In 2009, Casiraghi, who has a degree in philosophy and speaks three languages, self-published Ever Manifesto, a call to arms for better sustainability in fashion.“I haven’t been as conscious as I should have been,” Casiraghi said at the time. “We want to publish when we have something to say or people to support.” Spoken like a true royal.Gucci gown. Beauty note: Bring out cheeks with Gucci Golden Glow Bronzer in Indian Sand. Hair by Shay Ashual at Tim Howard Management; makeup by Dick Page for Shiseido; manicure by Daria Hardeman.