Monday, September 27, 2010 / 4:43 pm
The Late Show Preview
Katherine will be a guest on tonight's edition of "The Late Show with David Letterman" to promote the release of her new movie "Life As We Know It". Check out the preview clip from the program in which she talks about her battle to quit smoking and demonstrates her electronic cigarette to the host, with amusing results.
"The Late Show" airs on CBS at 11:35pm (10:35pm Central).