By Faith Richardson The Met Gala is one of fashion’s biggest events of the year, and if there’s one thing celebrities – and their makeup artists – know, it’s that preparation is everything. To make sure she was looking fresh-faced and glowing on the red carpet, Sabrina Carpenter made sure her skincare routine was up to scratch, but despite the A-list event she used a very affordable brand to help keep her skin clear and hydrated. Her makeup artist Carolina Gonzalez shared the skincare products she used on the singer ahead of her red carpet appearance, and it included Cetaphil’s Gentle Skin Cle…