Letterman show gossip

Blake Lively was spotted making her grand entrance to "The Late Show with David Letterman" in NYC on February 5, and I just have to wonder... did she change her outfit before she filmed the show? I didn't catch the episode, did anyone see if Blake did a little outfit switcheroo? Don't get me wrong, her outfit is basic and cute, but it's not really Letterman appropriate, right? She started with a light brown bomber jacket and paired with a basic scoop neck tee (like Rails' Kenna Long Sleeve Tee in Cream) and dark jeans (similar to James Jeans' Hunter High Rise Straight Leg Jean in Blue C), then slipped on a pair of suede boots and she was entrance ready. For those of you who can't get enough "Gossip Girl", it seems that there are some behind-the-scenes rumors that are causing a lot of, ahem, gossip. Allegedly, right before (and during) the writer's strike, the tension on set was skyrocketing between Blake and co-star Leighton Meester, as a source said, "Leighton Meester and Blake Lively avoid each other like the plague while castmates choose sides. Chace Crawford tends to stick close to Leighton, while Penn Badgley hangs on and offscreen with Blake. The crew will snag Blake for a scene just moments before it is shot so they can avoid any awkwardness with Leighton." I wonder sometimes why these people are the way they are.