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
Published: Monday Aug 25, 2008 | 05:50 PM EDT
More from PEOPLE
- Two Minnesota Sisters Found Dead on Vacation in the Seychelles
- Read the Cover Story: Brad & Angelina Split After 12 Years: It's Over
- Male DNA Found in Lisa Ziegert Murder Case, 24 Years After Her Death
- Congress Avoids Government Shutdown by Passing Stopgap Spending Bill With $1.1 Billion for Zika Research
- Black-ish Star Yara Shahidi Explains Why Zoey Doubting Her Faith Is 'What Most Teenagers Go Through'