Christina Aguilera pairs her red lip with shiny black nails - we'll bet it's Chanel Black Satin, which you can copy with OPI Black Onyx. Kim Kardashian goes for a metallic mani, something like China Glaze Passion. It's back to OPI again and their new summer range if you want to get the look of Jessica Simpson's nails. Her color closely resembles Jade Is The New Black.