Billy Joel heading into a cigar club with "an unidentified pretty brunette" ... Madonna visiting a doctor's office uptown and later leaving the Standard Hotel with Jesus Luz in tow ... Samuel L. Jackson crossing the street in Midtown ... Adrien Brody chilling in the West Village ... Kelly Ripa picking up daughter Lola from school ... Taylor Momsen shooting scenes for Gossip Girl ... Carlos Leon kissing his girlfriend outside Café Gitane on Mott Street ... Frank Sinatra Jr. hanging out in Midtown ... Jerry Seinfeld and wife Jessica walking on Central Park West this morning ... Catherine Zeta-Jones walking to a rehearsal for her new Broadway show, A Little Night Music ... and Katie Holmes playing with Suri at a playground on Long Island.