The lovable Jung sisters (Girls' Generation's Jessica and f(x)'s Krystal) are back again, and this time, they have come forward as doppelgangers!

Krystal shared on her Instagram,�"Can't deny we look alike :P," along with a selca of her and her older sister giving the same puppy face to the camera. They dressed alike as well in cream-colored chiffon dresses. Krystal also showed love for her sister on National Siblings Day, leaving fans smiling at their sisterly bond.

Fans agreed with Krystal and shared, "I can't decide who's prettier between them," and "Their parents must be so proud."