Gwyneth Paltrow's bid to reestablish herself both as a commercially viable actress and a MILF-y sexpot reached new heights last night on The Late Show With David Letterman. After running into the Ed Sullivan theater looking like she just got done with a spinning class at the Equinox Gym, she entered David Letterman's notoriously chilly environs wearing a sleeveless top that was scantily cut down to there. After dispensing with the formalities (Dave complimented her towering heels, asked how the kids were, blah blah blah), Gwyneth launched into a story about how she had trouble performing a certain scene while filming Iron Man because she had recently injured her knee. While Dave feigned interest in the story of her damaged joint, Gwynnie recognized his lack of interest and decided to do something about it. Namely, she gave his knee (and a bit of his thigh) a nice little rubdown. While we can spout off a number of instances over the years where Dave has been kissed, hugged and even flashed by his guests, we believe this is the first time a guest has ever dared touch Dave's leg for this length of time. More pix of Gwyneth, including the lacy see-through getup she wore to an Iron Man screening last night, after the jump.