Tom and Julia headed to The Late Show to promote their new flick, Larry Crowne, Tuesday night.

The movie is Hanks' pet project -- he directed it and co-wrote it with My Big Fat Greek Wedding star Nia Vardalos (Tom and his wife Rita produced Wedding after seeing it as a play.)

Hanks got the crowd outside laughing with his cute antics, then had the Late Show audience rolling with his dead-on impression of director (and friend) Ron Howard. Said Tom: "I'm going to get a Tweet from Ron about this after." Love it!