Star Tracks
With her pooch in tow, the Gossip Girl star celebrates her 21st b-day on the New York City set of her show. Plus: Ashlee Simpson, Lindsay Lohan, Paris Hilton and more
Credit: James Breeden/Pacific Coast News
Published: Monday Aug 25, 2008 | 05:50 PM EDT
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The Hills' Heidi Montag catches the dance fever while filming a video for her song "Overdosin'" in Los Angeles recently.
