Celebrity makeup artist Alexis Oakley stopped by the Page Six Studio to answer burning questions from the Confession Cube. The content creator is gearing up for her “Alexis Oakley Beat” masterclass tour, but first, she spilled behind-the-scenes glam stories from working with Demi Lovato, Alix Earle, Simone Biles, Tana Mongeau, Kris Jenner, Avril Lavigne, Gypsy-Rose…