Two Mad Men stars wowed on the red carpet this week, making us miss the show already. While they kept things super classy and sophisticated, cool girls like Dree Hemmingway and Maggie Gyllenhaal mixed things up a bit. Also, we're starting to get a little obsessed with Ashley Madekwe, who looked super cute in a Zimmermann number. All that and more in our latest best dressed gallery. Click on through!