Girls' Generation / SNSD performed Britney Spears "Circus" on the January 31st episode of Music Core. They didn't sing, they just danced to the song very provocatively. They looked hot wearing tight black clothing. It's quite unfortunate that the performance was so short. For the horny guys watching the video with their pants down, you'll probably have your very own short performance. Check out the hot dance below. Video Credit: CodeAnalysis. Another performance can be found here Entertainment Relay Special Day with SNSD: (credit: HarueKorea)