Round faces look best in simple low-maintenance hairstyles like this one. Styles that are too busy or big or fussy tend to obscure any interesting facial angles, creating a flat featureless appearance. This style gives Cattrall's face room to shine.

Nixon, like her cast mate Kim Cattrall, has a gorgeous round face, not to mention, amazing porcelain skin. This layered bob hairstyle stays out of the way to let Nixon's face take focus. The rich copper color brings her skin to life.

There's a fine line between simple and mousey. Can you guess which kind of hairstyle this is? Most women with round faces should avoid masculine styles that pull hair back away from the forehead, and Nixon is no exception. And it's best not to emphasize pale skin with washed-out hair color.

On this one occasion, Nixon wore an uncharacteristically romantic, girlie, long hairstyle. And the results were fabulous. Carefree tousled waves in a warm glowing copper red make this SATC girl look like a romance novel heroine.

It never ceases to amaze us how stylists can take a nearly perfect beauty like Davis and do something with her hair that makes her look like an awkward 13-year-old at the school dance. With a face like that, keep it simple, stupid!