The singer IU, who was thought to be skinny, revealed her cute stomach fat.

In various online communities, pictures of IU during her concert were posted under "IU's first revealing of belly button."

The revealed pictures were from IU's first concert "Real Fantasy." In the pictures, IU has her hair to her sides with a big ribbon hair band. Wearing shorts and a shirt, she's waiving her hand, unintentionally revealing her belly button.

IU's body, normally known as 'an elementary student's body', had an unexpectedly chubby stomach, catching much attention.

Internet users who saw this commented, "You can't call that fat," "Even her stomach fat is cute," and "Her body right now is perfect and cute."

Photo Credit: Online Community