Nick Jonas is used to screaming crowds of kids --- his Jonas Brothers days prepared him well for that --- so willingly entering the most chaotic toy store in the city doesn't seem to phase him. Jonas just had the urge to tickle the ivories of The Big Piano at FAO Schwarz, just like hundreds of kids do every day.
If you think his single "Jealous" is too inappropriate for kids to hear, don't worry too much; it looks like the toy store shut down the area for Jonas as there only seems to be respectful adults in the crowd. No screaming ladies? This certainly is a different kind of concert for Jonas, indeed.
Check out Jonas's fancy footwork in the video below: