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

GOOD SPORTS

In town for the U.S. Open, tennis star – and John Mayer childhood pal – James Blake teams up with Maria Sharapova for a glamorous moment Friday at Heineken's Official USTA Player's party at New York's Empire Hotel.