The singer suits up as a police officer on the Harlem, N.Y., set of her new video. Plus: Pete Wentz, Kanye West, Britney Spears and more


After re-teaming for an episode of Project Runway, host Heidi Klum and season 5 winner Christian Siriano put their fiercest faces forward Thursday while hanging backstage before his spring 2009 show for Mercedez-Benz Fashion Week in New York City.

See Christian Siriano's Fashion Week runway show!