MAMAMOO is celebrating their sixth anniversary together!

Fans are using the hashtag #THANKU_619 to express their gratitude towards the talented artists! 

The group's official Twitter account posted a special birthday message as well and reads as follows: "We are grateful to our MooMoos for walking with MAMAMOO. Let's make fun and happy memories from now on as well." Fans are expressing their love for the bright and cheerful group, saying: