David Letterman made light of his affairs Monday night on The Late Show and apologized to his wife Regina Lasko. "Right now I would give anything to be hiking on the Appalachian Trail," Dave joked, a snarky reference to South Carolina governor Mark Sanford's made-up alibi during his recently disclosed affair. "I got into the car this morning and the navigation lady wasn't speaking to me." (Photo: WENN)

Watch it here:

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