Blake Lively and Leighton Meester walking down Prince Street yesterday where they were filming scenes for Gossip Girl ... Hugh Jackman playing with daughter Ava at a playground in the West Village ... Nicole Kidman and Keith Urban leaving their downtown apartment separately ... Vanessa Williams walking in Midtown ... Daniel Radcliffe signing autographs for fans on his way into Regis and Kelly ... Naomi Watts carrying shopping bags in NoHo ... Kate Mara filming scenes for Happy Thank You More Please downtown ... Kat Von D arriving at MTV's studio in Times Square ... Penn Badgley standing on the sidewalk in Midtown ... and J.K. Rowling leaving Monkey Bar on East 54th.