Nick Jonas has come a long way since he burst onto the scene with his brothers in 2005 as the curly-haired singer and youngest sibling of the Jonas Brothers trio.

Boy bander no more, the "Chainsaw" singer is all grown up with a sound to match his new superstar image — which can be heard on his latest, most sensual record yet, Last Year Was Complicated. Nick has since proven himself a bonafide post-Disney heartthrob, and an equally talented performer.

While every day is an excuse to honor the Kingdom actor's beautiful physique (ahem, and we have), we’re celebrating Nick’s birthday (September 16) with some secret (and slightly TMI!) facts about the star even his own fans might not know. From dating pet peeves to unthinkable tickle spots, we've got you covered with all there is to know about the "Jealous" crooner.

Flip through the gallery above to find out more about Nick Jonas.

Happy Birthday, Nick!

 Nick Jonas' Hottest Instagram Photos: