Ah, one of our favorites. California girl Cameron Diaz always manages to get the perfect mix of fun, casual, sophistication. Here she walked the red carpet in Seven for all Mankind jeans with a simple Thom Browne top. To add a little color she wore strappy red heels and a beautiful red lip.

To get her look, color block. It sounds complicated but it's not. Cameron often wears blocks of two or three colors at once. Here it is the red lip, white shirt, blue denim, red shoe. It's easy to achieve her style on your own by following this easy rule.

• Seven for all Mankind, Tobi, $165

• Thom Browne, Barneys, $265