The minute I set eyes on top facialist Joanna Vargas, it was obvious from her radiant complexion why the likes of Dakota Johnson, Helena Christensen and Maggie Gyllenhaal rely on her. Women actually book in to her clinics in LA and New York with the sole intent of getting her signature ‘Julianne Moore’ glow. So naturally, I asked what – aside from the fancy, high-tech machines she uses on clients – is her secret to getting great skin at home.