Happy birthday, Joe Jonas!

The middle JoBro is hitting a huge milestone today—turning 21. But the newly legal singer wasn't celebrating early on Saturday night by hitting the clubs...the birthday boy was hard at work on tour.

Joe (who was showing off his muscles in tight black tank), Kevin and Nick were playing a show in Hershey, Pennsylvania, when his brothers stopped the show to acknowledge the  big day...

Kevin told the crowd: "I think it's important that we celebrate with our friends as well. So we wanna bring out a little something for you, Joe."

"Why don't we sing happy birthday to Joe?" Nick added, as the crowd broke into Happy Birthday.

Kevin's wife Danielle and another female friend brought out a birthday cake that Joe helped them light before blowing out the candles and licking off some frosting.

Both boy and cake looked yummy! Since when did Joe turn into such a beefcake?!

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See how other stars celebrate in our Celebrity Birthday Bashes gallery!

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