Anderson Cooper arriving in LA after a flight from NYC ... Ed Westwick leaving his trailer on the Gossip Girl set ... Matthew Broderick helping son James with his scarf in the West Village ... Kiefer Sutherland signing autographs outside NBC ... Kirsten Dunst walking down the street... Katie Holmes getting out of an SUV outside the Schoenfeld Theatre ... Alec Baldwin and Salma Hayek standing on the set of 30 Rock ... Madonna's daughter Lourdes walking with her father Carlos Leon ... Madonna carrying son David into the Kabbalah Center and later visiting a preschool on the Upper East Side ... Twilight star Robert Pattinson leaving his hotel ... Rosie O'Donnell and Becky Newton outside the Conan O'Brien show ... and Alex Rodriguez getting into a cab in Midtown and having lunch with music manager Guy Oseary at Da Silvano yesterday.