Nick Jonas posted a topless photograph of himself on Instagram. The photo shows the twenty-year-old singer showing off his muscular torso with his Nike shorts resting dangerously low on his hips. He added the caption "I never do this but... Healthy living and fitness update. Post workout picture. #diabeticinshape #2.0."

Nick Jonas
Nick Jonas at the opening night of Buyer and Seller, Barrow Street Theater, New York.

The picture has attracted a great deal of attention, receiving over 198K likes on Instagram. Many fans have expressed their appreciation of the Jonas' physique. Whilst others have commented on his diabetes and his role as a spokesperson for the condition, a number claiming he is inspirational to sufferers. 

Jonas was diagnosed, according to MTV, with type 1 diabetes in 2005 and has made numerous interviews in order to raise awareness of the condition. He told Diabetes Health in 2007: "I have a platform to be able to share my story.  I have this passion to be able to share with young people my age and be a positive light in a situation that might not be so positive."

Nick, Kevin and Joe Jonas
Nick, Joe and Kevin Jonas at the 2013 Miss USA Pageant, Planet Hollywood Resort, Las Vegas.

If Nick can keep up the hard work is another matter as it's going to be a busy year for the Jonas Brothers

Nick and his brothers, Joe and Kevin, are about to release their fifth studio album 'V' (as in the Roman numeral and not the letter). They are currently on tour and no release date has been set for the album. Kevin is also expecting a baby with his wife and Married to Jonas co-star Danielle Deleasa

Nick and Danielle Jonas
Nick Jonas with his wife Danielle at a New York Rangers charity event.