Fans around the world are celebrating Seventeen member Joshua's 21st birthday on December 30 KST.![](https://www.allkpop.com/upload/2017/12/content/joshua_1514563289_senventeen.png)
Fans are trending #PrinceJoshuaDay worldwide via Twitter, sending out supportive messages wishing the star a happy birthday.
A very happy birthday to Joshua!
![](https://www.allkpop.com/upload/2017/12/content/joshua_1514563289_senventeen.png)
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