Stephanie Birkitt Cheated On Joe Halderman With David Letterman: Report

03/18/2010 05:12 am ET | Updated May 25, 2011
  • Stephen M. Silverman People

According to the newspaper, Birkitt, Letterman's former personal assistant, wrote that she continued her affair with Letterman even after moving in with Robert "Joe" Halderman, the CBS producer now charged with attempting to blackmail the late-night host.

Last fall, according to the Post, Letterman, now 62, and Birkitt, 35, hiked together at his expansive Montana ranch, where Letterman and longtime girlfriend Regina Lasko, the mother of his son, Harry, were married this past March.

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