What a difference volume makes. This medium-length hairstyle creates the illusion of having the highly desirable oval face shape. Volume at the sides creates the illusion of fullness at the cheekbones. Bangs lightly dancing on the forehead reduce its dominance. Plus, we're pretty sure this look is the definition of "great hair."

We're not sure why Knightley would want to hide her stunning good looks with this afterthought of a hairstyle. But take it from us, if it doesn't look good on her, it almost certainly isn't going to look good on any of us. Hair that's above the shoulder needs to be kept simple and neat. These almost-waves might have worked on longer hair. The result here made us wonder if Knightley had cut her hair herself that morning.

This is possibly the perfect hairstyle. Nearly everyone on earth can wear it and look her best. This style is versatile, sophisticated, feminine and chic. To get the look, go for a shoulder-length medium cut with long layers. You can wear it stick-straight, or blown out (as seen here), or in beachy waves. It goes up in a twist or back in a pony in an instant, while the front layers automatically style themselves.