US Magazine: David Letterman and his longtime girlfriend, Regina Lasko, have gotten hitched, Usmagazine.com has learned. The CBS Late Show host and Lasko tied the knot Thursday evening, a source tells Us.

The two -- who began dating more than 10 years ago when Lasko worked for him on his show -- welcomed son Harry in November 2003. In 2007, Letterman told Oprah Winfrey that his son Harry has made a "huge difference" in his life -- but the boy doesn't always get his daddy's sense of humor.

Said Letterman, "Mommy has to tell him a lot that I'm just teasing." Letterman was previously married for seven years to his college sweetheart Michelle Cook.

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