By Adam B. Vary
March 23, 2009 at 12:00 PM EDT

David Letterman announced during a taping of tonight’s Late Show that he and his longtime girlfriend, Regina Lasko, were married last Thursday in a small town in Montana, reports the Associated Press. Lasko and Letterman have a five-year-old son, Harry. The host said he began dating Lasko in 1986, and joked that in staying unmarried for so long he was the “last of the real gunslingers.”