Secretly, in Montana, to his long long longtime gf and mother of his 5-year-old son Harry, Regina Lasko. Wow. Letterman was a confirmed bachelor after his first marriage ended in '77 - but then, he didn't have the kid until he was 56, so maybe he's late coming to these things. Here's what Dave reportedly said to his studio audience during the taping of his show tonight - we'll get you video of this as soon as we've got it...

"Regina and I began dating in February of 1986, and I said, 'Well, things are going pretty good, let's just see what happens in about 10 years,'" joked Letterman.

"I had avoided getting married pretty good for, like, 23 years, and I