Do you think January Jones and Jessica Paré are ever like, "Is Kiernan coming tonight? Yes? Then I'm calling in sick." The Mad Men actress, who blows out 15 candles today, consistently deploys such fashion-forward yet age-appropriate ensembles—from brands like Delpozo and Miu Miu, no less—that she shows up costars decades her senior. Cheers to you, Kiernan Shipka, and here's to many more years of you making us want to be better-dressed people.