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Best: Spice Girls
No matter how you felt about them in the '90s, there was no denying these gals knew how to party -- and what better party to join than the closing ceremonies? Victoria "Posh Spice" still seems awkward, but now that she's a fashion designer, she's allowed -- plus she (as well as the rest of the spices) remembered their old moves and seemed to genuinely be having a ball. Maybe they weren't the most serious or iconic of Brit performers, but they were definitely the most fun.