Even someone who's known for her outrageous style appreciates the opportunity to dial it down on occasion. Katy Perry has proven that she can wear red carpet couture just as readily as confection-colored frocks. She's been dressed by some of fashion's best, such as Christian Dior, Elie Saab and Alexis Mobille. This means ditching the neon blue wigs and dyed pink locks in favor of monochromatic up-dos. Take note and don't be afraid to switch up the jeans and T-shirts for a fancy dress occasionally.