Katy Perry is Pom Pom Pretty

Katy Perry shows off her pom pom knit hat as she arrives at LAX International Aiport in Los Angeles on Thursday (December 24).

The 25-year-old singer was spotted across the pond spending time with her boyfriend/comedian Russell Brand.

Katy‘s hit single, Hot ‘N Cold as well as the Bee Gee’s Stayin’ Alive will be part of the soundtrack for Alvin and the Chipmunks: The Squeakquel. Sounds like fun! The movie opens TODAY!

10+ pictures inside of Katy Perry looking pom pom pretty…