Credit: Imeh Akpanudosen/Getty Images Photo: Nick Jonas Arrives at the House of Blues on August 27, 2011

It case it wasn't crystal clear before, Nick Jonas is all grown up.

The 20-year-old singer — and ex-boyfriend of Miley Cyrus and Delta Goodrem — is on tour with The Jonas Brothers, but took a break to share this shirtless selfie on Instagram:

Credit: Instagram Photo: Shirtless Nick Jonas posts buff selfie on July 30, 2013

"I never do this but... Healthy living and fitness update. Post workout picture. #diabeticinshape #2.0"

He's proud and he wants to show it off! Looking at him gives us an Emma Stone/Ryan Gosling "Seriously? It's like you’re Photoshopped" moment.

Nick and the JoBros are in North Carolina right now, and Nick tweeted that it made him feel “very nostalgic” to be there, since his Charlotte-shot movie, Careful What You Wish For, just wrapped two months ago. In the film, Nick gets sexy with his married neighbor. So he’s putting that bod to work!

What do you think of Nick’s shirtless photo? Sexy? Silly? Inspiring? Off-putting?

Sources: @NickJonasInstagram