Last Night's Look: Hit or Miss?

Vote on this week's styles by Blake Lively, Mariah Carey and more stars! You decide – are they fashionistas or flops?

MICHELLE WILLIAMS

Leaving her adorable daughter home for the evening, the hands-on mom has a grown-up night out in a white dress with gold-beaded shoulder, matching metallic sandals and boxy clutch at the Fresh Air Fund Salute to American Heroes in Manhattan.