2ne1 - 敏智 (fire)
Nam Ji-Hyun of 4minute doing the splits as her finishing pose for Hot Issue. Check out that turned out foot - since she's holding this in air, the position makes the split more difficult!
Victoria of f(x) who is known to be an amazing dancer - though these aren't technically splits, this stretch is notable!
edit: Of course, we can't forget
Gahee of After School, thanks shinnie8!
ALL of
SNSD. One word: HOW?
Ha Ju-Yeon of
Jewelry kicks up her leg, flashing this awesome split for a moment.