Jonas, 23, said the former Disney star is very passionate about her work and one has to agree as she is always right, reported ET online.
"Demi's incredibly passionate. When she gets stuck on an idea and she's passionate about it, you have to go with her lead because she's always right. Almost stubborn! Almost. If I say that I'll get in trouble," he said.
When asked about his fashion choices, the 23-year-old singer said he followed only one very important piece of advice, "You have wear the turtleneck. You can't let the turtleneck wear you.