The It-iest of It Girls were back in full force this week with an all-black dress code that screamed cocktail chic. Powerful evening dressing was the rule to live by, it would seem, for these fashionable femmes in the past seven days. Save for two white ensembles, a gorgeous red gown, and a stunning metallic green Prabal Gurung mini (on Blake Lively), every girl on our best-dressed list was donning a covetable noir getup. From the stunning Mila Kunis to the beautiful Anne Hathaway, check out these stylish picks and begin taking mental notes for the upcoming round of holiday parties!