Keren Bartov has her own eponymous skincare brand. Keren Bartov Keren Bartov is a facialist and skincare entrepreneur with clinics in London and Tel Aviv. She also works with A-list celebrities like Kim Kardashian and Beyoncé in the US. Bartov uses high-tech machines that use light therapy and lasers to brighten and tighten skin. In the world of the rich and famous, Keren Bartov is the person you call when you need a facial. The Israeli entrepreneur has built a luxury skincare empire with a seemingly endless list of A-list celebrity clients. Kim Kardashian, Julia Roberts, Mila Kunis, and Gal Gadot are regulars. Over the Met Gala this weekend, Bartov revealed she was the facialist behind the glowy complexions of Beyoncé and Hailey Bieber. Still, Bartov says that what we see online is a fraction of her client roster. "What you've seen on Instagram is nothing," she told Business Insider in a recent conversation, speaking from her home in Israel.…