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.
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
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— suga pics (@SUGAPlCS) September 11, 2017
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KIM NAMJOON
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I can't believe I finished in time c': #HappyNamjoonDay to our amazing leader!
— (@caeious) September 11, 2017
-#BTS #????? #??? #???? #RAPMONSTER #Namjoon #BANGTAN pic.twitter.com/l1dqNM2fow
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