COMMERCIAL IMAGE: In this photograph taken by AP Images for Mattel, Choreographer JaQuel Knight leads a group of dancers in a performance of "The Barbie" dance routine during the Teen Vogue Block Party Thursday, Sept 10, 2009 in New York. Knight, the talent behind Beyonce's "Single Ladies" dance, choreographed "The Barbie", a doll-inspired routine set to a re-recorded version of the 90's hit song "Barbie Girl".