Chrome Entertainment's second girl group also known as Crayon Pop's 'younger sister group' Bob Girls revealed their first pictures during their dance practice.

Bob Girls, composed of 4 members, posted on their Facebook yesterday, "Practicing hard!!" along with pictures.

In the pictures, the members are seen practicing their dance or posing at the camera, making hearts and other cute poses.

One representative said, "Bob Girls is debuting mid-June so they have been practicing at least 12 hours a day from vocal lessons to dance, instruments, physical health, and acting."