Selena Gomez: Princess Peach on 'Jimmy Fallon'!

Selena Gomez wears a Luigi mustache and a Princess Peach crown during her appearance on Late Night With Jimmy Fallon on Tuesday night (March 19) in New York City.

Later that night, the 20-year-old actress and singer was spotted arriving at the airport for her flight out of town.

PHOTOS: Check out the latest pics of Selena Gomez

The night before, Selena opened up about her ex-boyfriend Justin Bieber during an appearance on the Late Show with David Letterman.

FYI: Selena is wearing an Antonio Berardi dress and Brian Atwood heels.

20+ pics inside of Selena Gomez on Jimmy Fallon and leaving NYC…