If you didn't already know, this week's 'Music Bank' featured special performances by some of your favorite idols for its 700th episode special. One of those idols was girl group Nine Muses, who put on the classic by Park Ji Yoon, "Adult Ceremony".

The girls pulled off a great performance, and it turns out the secret behind it all was, of course, practice! So now that 'Music Bank' has aired, the girls have revealed a dance practice video for "Adult Ceremony" to show you all how they got ready.

Take a look below!