Girl group f(x)'s member Luna showed off her skinny body.

"f(x). 'All night', daily life, memories, all night all night! Color me with your own color," posted Luna on her Instagram on Monday. The caption is the lyrics to f(x)'s song "All Night."

In the picture, Luna has a face drawn on her hands and she is posing with her hands in front of the mirror. Her small waist is revealed through the crop tee she is wearing.