Straight hairstyles have made a major comeback. Click through the latest photos of celebrities with straight hair, and get the best tips to straighten your own hair. Plus learn how to keep hair shiny and healthy with the best shampoo, conditioner, flat iron and keratin treatment for your hair. Wondering the best techniques to blow out hair into a salon-perfect blowout? Our easy hair DIYs tell you how to get super-sleek looks like Gwyneth Paltrow, Sandra Bullock and Kim Kardashian.