Models are supposed to blend into the background and let the clothes grab the attention. But after yesterday's mini-kerfuffle, in which it was discovered that some glazed-over soul at Style.com had confused photos of Chanel Iman for those of Jourdan Dunn, we were reminded that perhaps mannequins do the job a little too well and fashion insiders can't tell the girls apart. For shame! So, for the betterment of editors and insiders everywhere, we've provided a quick run-down of oft mislabeled girls, some who look alike and others who — well, frankly, we all should know better. Nevertheless, correctly calling these faces can be tricky (especially after a few glasses of champers), and we advise you to carefully study the following faces. —Kendall Herbst Chanel Iman and Jourdan Dunn.

Gemma Ward and Sasha Pivovarova.

Tao Okamoto and Han Jin.

Alison Nix and Rachel Alexander.