Monday, September 11, 2017 
The BTS member was born on September 12, 1994, and this year, he's turning 23-years old.
Thousands of fans around the world are leaving congratulatory messages for the idol star on Twitter with the hashtag #HappyNamjoonDay, which has quickly become a worldwide trend.
SEE ALSO: An English expert evaluates BTS RM's English skills
Big Hit Entertainment also shared an adorable birthday cut of Rap Monster for the special day.
Happy Birthday, Rap Monster!
HAPPIEST BIRTHDAY TO OUR ACTUAL AESTHETIC KING #HappyNamjoonDay pic.twitter.com/gAvGMGUrPI
— aricel / joon's day (@hollerbangtan) September 11, 2017
┏┓
— suga pics (@SUGAPlCS) September 11, 2017
┃┃╱╲ in this
┃╱╱╲╲ house
╱╱╭╮╲╲ we love
▔▏┗┛▕▔ & support
╱▔▔▔▔▔▔▔▔▔▔╲
KIM NAMJOON
╱╱┏┳┓╭╮┏┳┓ ╲╲
▔▏┗┻┛┃┃┗┻┛▕▔#HappyNamjoonDay
I can't believe I finished in time c': #HappyNamjoonDay to our amazing leader!
— (@caeious) September 11, 2017
-#BTS #방탄소년단 #김남준 #랩몬스터 #RAPMONSTER #Namjoon #BANGTAN pic.twitter.com/l1dqNM2fow
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