Rainbow member Jae Kyung revealed f(x) Sulli's special beauty know-how.

On a recent episode of OnStyle 'Get it Beauty,' MC Jae Kyung talked about the special make up of girl group idols concerned with aging.

During the filming, Jae Kyung mentioned the knee being a significant part of a women's body to look young. She brought up Demi Moore's recent surgery of eliminating wrinkles on her knees.

Jae Kyung said, "It's prettier when a woman has a good line of her knees."

In addition she said, "I have hot news, I heard that Sulli of f(x) uses makeup for her legs for on stage."

She said she got the special technique from Sulli. She said first you must wear a cream type pink blusher on the center of the knee bone then cover it with pink blush. She called it the well aging makeup.

Yim Ji Yeon from the movie 'Addicted to Human' was also on this episode of Get it Beauty.