The cornerstone of being a lifestyle guru is that you must have a lifestyle that people want. One that walks the fine line between envy—envy implies an undercurrent of resentment, a will-come-to-your-house-with-pitchforks-if-you-mess-up energy—and defeated acceptance, where the way you live is unfathomable, untouchable. (See: anyone with a gigayacht.) And the best tightroper in the business might be Jenni Kayne, the California-based, well, lifestyle guru.