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: Edward Opinaldo/ Pacific Coast News
Published: Monday Aug 25, 2008 | 05:50 PM EDT
More from PEOPLE
- Johnny Depp Freaked Out Black Mass Director's Kid Doing Jack Sparrow's Voice in Full Whitey Bulger Makeup
- Read the Cover Story: Adele’s Triumphant Return: How Love Changed Her Life
- Determined Bono Says Nothing Will Stop U2 From Performing in Paris
- Kyle Richards on Yolanda Foster's Divorce From Husband David: 'They've Been Struggling'
- Kobe Bryant Opens Up About His Decision to Retire: 'I'm Not Obsessively Thinking About the Game Anymore'