Enter ABDC Trivia Contest Week 5 now!

Time for more trivia about America's Best Dance Crew, for a chance to win some ABDC-related merchandise or an ITunes gift certificate.  Full rules here. The prize goes to the highest cumulative score (plus winner of the tie-breaker) over this 10-week contest.  The deadline for this puzzle is midnight on January 9, 2011.

Email ABDCContest@gmail.com with the answer to this question:  what ABDC contestant performed in a popular video that was used for another crew's "Music Video Challenge"? Note: please read the question carefully, since its specific phrasing ensures (I hope!) only one correct answer.