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: Kevin Mazur/WireImage
Published: Monday Aug 25, 2008 | 05:50 PM EDT
More from PEOPLE
See More News
10 of 18
Willy Wonka she's not: Madonna opens her Sticky & Sweet world tour in Cardiff, Wales, on Saturday with a commanding pose in knee-high leather boots and top hat – just one of her high-end costumes.
RELATED GALLERYMadonna: 50 Looks We Can't Forget
Copyright © 2014 Time Inc. All rights reserved. Reproduction in whole or in part without permission is prohibited.
In partnership with AOL