Group Orange Caramel's Nana revealed her secret to taking care of her body.

In SBS E! "Seo In Young's Star Beauty Show" airing tomorrow, Orange Caramel members will come out and talk about taking care of their milk-like skin and their body lines.

Nana revealed that her secret is keeping her back straight even when she's not on stage, and walking confidently like a model all the time.

Reina also talked about taking vitamins and other supplements to maintain her beauty, and Lizzy also talked about the secret beauty know-how that she recently started.

Photo Credit: SBS E!