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Joe Jonas ' looks over the years will make you want "Cake By The Ocean!"

Here is a 19-year-old version of the Jo Bro rockin' out at the "Camp Rock" premiere with shaggy hair back in 2008 ( left ). Playing 'Shane Gray' alongside Demi Lovato was his breakout role ...

And, 17 years later, the singer and hot zaddy of two showed off his chiseled face with a shorter haircut and mustache at SiriusXM studios in NYC ( right ). Gallery Launch Gallery Instagram

The "Sucker" singer celebrated his 36th birthday earlier this weekend, so with that being said, we mustache you one key question: Good Genes or Good Docs?!

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