'Singles' magazine released some more eye candy for fans of Jessica and Krystal in the form of behind-the-scenes photos from the sisters' pictorial.

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These pictures show the girls engagement in the shoot as well as their diligence as they strike different poses and facial expressions like the pros that they are. �Then, they are able to wind down a bit when the cameras aren't focused on them for the shoot.�

Check out these lovely sisters below.

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