Joe Jonas Celebrates His 21st Birthday (VIDEO)

Congratulations, Joe Jonas; you’re finally a full-grown man.

The Prettiest JoBro turned 21 years old on Sunday, and he marked the momentous occasion in a manner that befits a music legend: Being serenaded by thousands of adoring fans. He even got a jump on the celebration a day early.

Jonas’ fraternal pop-rock combo, The Jonas Brothers, performed in Hershey, Pennsylvania on Saturday night, and at one point during the set the musical festivities were stopped so that Joe’s sister-in-law, Danielle Deleasa, brought a birthday cake out onstage. The audience, meanwhile, joined in on a rousing rendition of “Happy Birthday,” before Joe drew a mighty breath and blew out the candles.

See video of Joe’s big birthday moment below:

Naturally, the party continued on the big day itself, with Popstar! Magazine presenting a cake to JoJo at Planet Hollywood in New York’s Times Square:

Want to wish Joe a belated happy birthday yourself? Make sure to enter Celebuzz’s contest to win a pair of tickets to the Jonas Brothers’ New York concert on August 18.

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