SEE ALSO: 'Knowing Brothers' reveals teaser for next week's episode featuring Apink

On the June 30th episode of the JTBC variety show, Na-Eun revealed some facts about the wonders of her own waist.

"My waist is on the thinner side. Every time I have a fitting, my waist measurement decreases," said Na-Eun. "To this day, I still don't know my own size."�She continued, "Back then, my waist used to be around 18 to 19 inches."�Hearing her words, Seo Jang Hoon remarked that that is the size of his own calves.�

Then, the cast of 'Knowing Brothers' decided to measure Na-Eun's waist on the spot. Measured on top of her clothes, Na-Eun's waist measurement of the day came out to be 21 inches.�

In other news, A Pink's new album 'One & Six' will be out on July 2!