Nick Jonas vs. Zac Efron

Although Nick Jonas and Zac Efron used to be tween idols, both stars have matured into adult careers. No worries, both men have retained their heartthrob status! Which singer/actor is more swoon-worthy?

Zac Efron is a long way from his 'High School Musical' days. The actor continues to push himself, starring in a variety of projects. Anyone who wants to see him smolder only needs to watch 'The Lucky One,' a romantic drama based on a Nicholas Sparks movie. Zac has also received numerous nods from People's Most Beautiful list. Not too shabby!

Nick Jonas also has us "burning up." The singer recently posted a shirtless selfie that sent fans into a tizzy -- and for good reason. His healthy lifestyle is clearly paying off! Additionally, Nick is involved in multiple philanthropies, including promoting research funding for diabetes. We love a guy who gives back!

Which of these stars makes you flustered? Vote in the poll below!