Girl group f(x)'s Amber revealed a picture taken with Krystal.

Today, Amber posted on her Twitter, "Picture taken with the princess... It's an honor" along with a picture.

In the picture, Amber and Krystal are posing for the camera with their faces close to each other's. They made cute faces by puffing up their cheeks.

At this, internet users commented, "So cute," "Prince and princess?," "f(x) hurry back."

Photo Credit: Amber Twitter