Katy Perry Sticks Out Tongue for Taboo on 'Fallon'!

Katy Perry sticks out her tongue while playing a game of Taboo during a taping of Late Night With Jimmy Fallon at Rockefeller Center on Thursday (October 10) in New York City.

The 28-year-old singer was on the show to promote her upcoming album Prism, which drops on Tuesday, October 22!

PHOTOS: Check out the latest pics of Katy Perry

Over the weekend, Katy showed some support for her boyfriend John Mayer, who wowed the crowd at the Hollywood Bowl.

In case you missed it, check out Katy reading mean tweets about herself for a segment on Jimmy Kimmel Live.

FYI: Katy is wearing a House of Holland top, Belstaff skirt, and Wolford stockings.

10+ pictures inside of Katy Perry appearing on Late Night With Jimmy Fallon…