Mary-Kate Olsen visits "Late Show with David Letterman" at the Ed Sullivan Theater June 26, 2008 in New York City to promote her upcoming film The Wackness.
The film costars Olivia Thirlby and Josh Peck and opens in limited release on Thursday July 3.
In case you missed the show, watch this video of Latterman Show.
Mary-Kate apparently went to the same high school with The Hill's Spencer Pratt.
She called him out, saying, "He doesn't have a good temper."
Here is MK surprisingly smiling....with new veneers.
