Are you posting a #WCW on Instagram today? If you haven’t already, you should, because today is International Women’s Day, a day when women all over the world are celebrating each other and the collective goal of building a more unified working world. And it’s no secret that the fashion and beauty worlds are led by smart, successful women who not only influence the way we shop, dress and curate our top shelves (not to mention our Pinterest boards) but also inspire us with their amazing personal achievements and career stories. From nail polish moguls and fashion designers to editors and photographers, we interviewed four amazing women who filled us in on their work wisdom, career advice and (bonus!) what they wore to their first interviews.