Nick Jonas I'm a Big Pianist ... Don't Be 'Jealous'

12/17/2014 6:00 PM PST

Nick Jonas killed it on the famous giant piano at FAO Schwarz in New York City ... playing his new hit song. And with a new show, new physique and hot GF -- we're declaring Nick the winner of 2014.

Yep, the whole damn year. Now check out his footwork!