We here at Styledash like a good bob. Naomi Campbell, Anna Wintour, Rachel Alexander and yes, even Posh Spice have been known to successfully rock the deceptively simple classic haircut.

But bobs, like high heels and red lipstick, don't work on everyone.

Feast your eyes on exhibit A: Hilary Duff's black bob wig from her latest perfume commercial.

The picture might be a little grainy, but where this hair style goes wrong on Hilary still seems clear. The first problem is the color. Pale girls don't look right with black hair. Chestnut or Espresso, absolutely. But jet or licorice? No.

The second problem is that the bob is too short. Trust me, no one has worn a bob that cropped since 1922. To put that in perspective, in 1922 we still thought cigarettes were good for your health.

My last and final beef is perhaps over something that Hilary has little control over: her lack of neck. Short hair on a short neck is not a good idea. Too much of one proportion blows it.