She embodies style, sass and a certain "Pow!" factor that you can't quite put your finger on.  Who were the "It" girls of 2010? First, 10-year-old Willow Smith hit the airwaves with "Whip My Hair," and the famous offspring definitely has a future in showbiz.

Princess-to-be Kate Middleton will probably be an "It" girl for years to come, and her wedding will just be the beginning this spring.

Other "It" girls include "Glee" star Lea Michele, Ke$ha and her dirty style, and "Dancing With The Stars" runner-up Bristol Palin.

Click to see the video, and find out who our favorite "It" girl of the year is!