SHINee and Girls Generation perform their songs together^^

The other day, SHINee, and SNSD performed their songs together...
They also danced to the remixed versions of their song..
SHINee started it off, then around the 50 second mark, SNSD popped up out of no where
But it was an awesome performance..

Here were the couple pairs:
Hyo Yeon - Onew
Soo Young - Key
YoonA - Taemin
Yuri - Minho
Jessica - Jong Hyun