Demi Lovato and the American singer-songwriter - Nick Jonas, are practically identical.

The longtime best friends started to talk in a new interview about their Disney careers together, the challenges that shredded them, as well as how they mended their strong bond.

Lovato stated that they joked around that time that it was Disney High, except that they all were shooting shows and really overworking. Lovato also said that she joked sometimes that she had posttraumatic stress disorder (PTSD) after leaving the channel, because if her schedule starts to get too busy, she got annoyed, Billboard reported.

While the former member of the pop rock band Jonas Brothers, talked about his relationship status since putting an end to his two-year relationship with the American model Olivia Culpo in January 2015. Jonas stated that it was the time in his life where he is single, but that has been tricky, according to PEOPLE.

But, Demi has some refreshingly honest advice for Jonas, Lovato stated that Nick is a guy in his twenties and he's famous. Lovato added that even when Jonas was in a relationship, Lovato told Nick to get out of that relationship. You could date anybody that you want at the moment, so go out and have fun, based on the report of MTV.

On the other hand, on Wednesday night, Nick took a group of diabetic fans from the Joslin Diabetes Center in Boston to an incredible night of fun and enjoyment.

Nick, who is diabetic himself, gave each of the diabetic fans a free suite. Jonas also talked to the diabetic fans about their diagnoses and his own experiences with the disease, Perez Hilton reported.

And a witness of the event stated that Jonas couldn't have been more humble and gracious with his guests.

To taste some of Jonas' music, here's his music video for the song "Chainsaw":