David Letterman’s surprise announcement last Thursday that he had engaged in affairs with female staffers earned him high ratings and laughs from his audience members, but one woman who was not laughing was the “Late Show” host’s wife, Regina Lasko. It was Lasko who demanded Letterman’s second public apology on Monday, FOXNews.com has learned.

Letterman addressed his wife directly during the taping of Monday’s “Late Show.” He said she had been “horribly hurt by my behavior” and stated flatly that his affairs “are in the past.”

He vowed to repair his relationship with Lasko, whom he married in March after a years-long courtship.

“Let me tell you folks, I got my work cut out for me,” he said ruefully.

But a source close to Lasko, 48, told FOXNews.com that the Monday apology “wasn’t something Dave wanted to do at all.”

“He wanted the whole thing to blow over,” said the source. “But Regina told him he better make an apology to let everyone know how sorry he was for how much he hurt and humiliated her.”