The 10-year-old “Whip My Hair” singer debuted a new hair ‘do and came out to support Jaden.
Willow watched from the side of the stage as her big bro, 12, performed with Justin Bieber.
Willow also met up with Katy Perry backstage!
10+ pictures inside of Willow and Jaden Smith at Z100′s Jingle Ball 2010… More Here! »