While Katy Perry dazzles on stage in cupcake bras, pink wigs, and cotton candy makeup, what really stands out about the American Idol judge is her glowing skin. The “Never Really Over” singer has been taking care of her skin ever since she developed acne in her teens. Today, you’ll notice that the 35-year-old popstar has a radiant, blemish-free complexion, thanks to tried-and-true routine. Here, everything…