If we could learn all of Beyoncé's beauty secrets, we absolutely would, but we'll settle for just one for now. The superstar loves Rosebud Salve, which is an absolute cult classic. She told Allure, "I wear it with my lipstick. I did this trick last summer, when I was on vacation: I used it to prime my lashes before curling. It was like a natural mascara. It made the lashes hold the curl and look shiny. I use it for everything!"