03/18/2010 05:12 am ET Updated May 25, 2011

David Letterman Sex Tape: National Enquirer Says Dave, Female Staffer Filmed Romp

Scandal-plagued talk-show host David Letterman has been rocked by a shocking new bombshell - reports of a sex tape showing him with a female staff member.

A studio surveillance tape reportedly caught the 62-year-old star and a much-younger female co-worker in a compromising position - and it could shatter Letterman's already troubled marriage, say sources.

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