Katy Perry performs for UNICEF after joining the charity as an official ambassador! #GoKaty This image appears in the gallery:Jingle Bell Ball 2013: Road To The Ball 14. Katy Perry performs for UNICEF after joining the charity as an official ambassador! #GoKaty Katy Perry attends the 9th annual UNICEF Snowflake Ball 30 images See the full gallery: Jingle Bell Ball 2013: Road To The Ball