Matt Damon Does Matthew McConaughey

Matt was all smiles when he showed up for Letterman yesterday. As usual, he graciously signed autographs and posed for pictures with his adoring fans before going into the Ed Sullivan Theater. Matt was there to promote The Good Shepherd but he ended up doing his best Matthew McConaughey impression. Watch Matt do Matthew below.

For more pics of Damon coming and going from Letterman, just read more