The SMTOWN boys weren't the only ones at the recent Halloween party. Popular celebrity sisters Girls' Generation's Jessica and f(x)'s Krystal also hung out during thelabel's get-together.

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Jessica posted the photo above onto her personal Weibo account. To make up for their lack of costumes, the two sisters seem to have made 'hand masks' instead. Regardless, their beauty still shone through in the sweet sibling picture. The black-and-white filter gave the picture a nice, elegant touch, making it look like it should be in a photo shoot.

Fans commented, "Pretty Jung sisters," "They're so cute," and more. 

Do you think Jessica and Krystal dressed up later?