Parker Posey walking her dog through the Village ... Katie Holmes leaving another day of rehearsals and walking to a playground with Suri a few hours later ... Mariska Hargitay, Christopher Meloni, and Luke Perry shooting a scene for Law & Order in the meatpacking district ... Kelly Ripa outside the David Letterman show ... Blake Lively and Taylor Momsen showing up to the Gossip Girl set in Chinatown ... and Lydia Hearst and Aubrey O'Day posing for a Tara Subkoff "photo shoot" downtown.