Luke Wilson's Decoy Outside the "Late Show with David Letterman"

We were waiting for Luke Wilson to arrive in a shiny black SUV, when all of a sudden we see him walking down 53rd street. It turns out it was a decoy. There was a tall blond in a black dress that was riding in the Town Car with him, that he didn't want to be photographed with. You'll see her exit (1:06 in the video) the studio moments before he does, and go directly to the awaiting Town Car. Luke didn't sign any autographs until he saw that she was out of sight. Does anyone know who she is?