The Met's Costume Institute Gala served as a fashionable playground for celebs, designers, and models last night. From the best-dressed to the not-so, there are plenty of style lessons to be learned from the ladies who strutted their stuff on the red carpet. Let's focus on the positives, shall we? Like how complementary BFFs Stella McCartney, Liv Tyler, and Kate Hudson looked together. Style lesson #1: stylish BFFs are your best accessory! Enter for more lessons learned from last night's most impeccably dressed.