Katy Perry, Paramore, B.o.B., Justin Bieber & More at Z100 Jingle Ball in NYC (photos)

Katy Perry

Hayley Williams (of Paramore) and B.o.B.

Hayley Williams (of Paramore) & B.o.B.

Jay Sean

Kim Kardashian & Justin Bieber

Justin Bieber

Travie McCoy

Katy Perry

Selena Gomez

Hayley Williams (of Paramore)

Photos via Neon Limelight