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The oblong shape is possibly the most challenging face shape to style. Kelly Rowland gets it right with long side-swept bangs and volume at the sides, which together work to create the illusion of facial fullness while minimizing face length.

Diamond face: the worst
Diamond shapes should stick with graceful, flowing styles that avoid volume at the top and sides. This look is all top volume, which gives Rihanna a bit of a "Conehead" look.

Oval face: the best
When you're blessed with a symmetrical oval face, you should show it off. Halle Berry's simple feminine updo lets her face do the talking.

Round face: the best
Simple lines with as little volume at the sides as possible, like this simple mid-length bob, are the best choice for round faces. Ginnifer Goodwin gets it right.

Square face: the worst
Heavy bangs typically exaggerate a square face shape. Pulling the rest of the hair back makes Jessica Alba's face look even more square, flat and ungraceful.

Oblong face: the worst
While bangs can work for oblong shapes, they should be soft and preferably angled to help create the illusion of roundness. Stick-straight bangs with stick-straight sides just flatten and further elongate Liv Tyler's face in this photo.

Heart face: the worst
Heart-shaped faces should avoid styles that emphasize a bare forehead and open up at the sides, emphasizing the width of the face. All you see here is Ricci's forehead. We think Christina should stick with the bangs.

Square face: the best
The most famous square face in the world knows to keep the hair soft and flowing, with volume only at the crown. While hair should be sleek, it shouldn't hug the face and flatten its contours.

Oval face: the worst
Compared with her simple updo, this tousled, face-hugging style with a lot going on manages to make even one of the world's most beautiful oval faces look ordinary.

Round face: the worst
This center part emphasizes a full forehead, and the volume at the sides widens the cheeks. Clarkson would look much slimmer with volume at the crown and sleek sides.

Diamond face: the best
A diamond face is an oval with angles. Almost any style works for this shape, but soft draping bangs and gentle sweeping lines are great for countering the shape's sharp angles. This bob is one of Rihanna's best looks.

Heart face: the best
A heart-shaped face like Christina Ricci's can look like a work of art with the right hairstyle like this simple bob. Keep the bangs narrow (width-wise) in order to minimize a broad forehead. Length should be chin-length or longer with no volume on the sides.