Girl group f(x)'s Sulli revealed a cute lip mask self-camera.

Yesterday, Sulli posted on her Twitter, "This is a lip mask," along with a picture.

In the picture, Sulli is wearing a gel-type lip mask on her lips, making a cute face at the camera. She also wore a pink hoodie to match the color of her lips.

Internet users who saw this commented, "So this is the secret to your cherry lips" and "So cute."

Photo Credit: Sulli Me2day