It's Cher!
After being repeatedly asked to appear on the talk show, Cher didn't make it until 1987. Once on stage, she notoriously referred the host as an "a--hole."

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CBS
Star:
David Letterman
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David Letterman Biography

David Letterman Photograph
David Letterman hosts our favorite late-night talk show. His top 10 lists are always good for a laugh. In the summer of 2009, he got into... More »
Full Name
David Letterman