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David Letterman, Lindsay Lohan

CBS; Jamie McCarthy/WireImage.com

As soon as we got the annoncement we set the DVR: Lindsay Lohan would be presenting the Top Ten list on Thursday's Late Show With David Letterman live via satellite from Los Angeles.

But then Lindsay herself chimed in late last night: "I am NOT going to be doing David Letterman, I'm not sure how this happened, but I am sorry for the confusion…," she tweeted. The Letterman crew confirmed the bad news just now: the Lohan stunt had been nixed and the reason is—in typical Lohan fashion—just plain weird.

A rep for Letterman's Worldwide Pants says the show was suckered.

"Lindsay Lohan will not be delivering a Top Ten list on Thursday's Late Show With David Letterman, as had been previously announced," said a chagrinned Tom Keaney in this morning's statement.

"We made a mistake. Someone purporting to be a friend of Lindsay's reached out to the show yesterday, allegedly on her behalf, and booked her to appear. Clearly, this person was not authorized to make commitments on her behalf. We wish Lindsay well, and look forward to having her on the show in the future."

For once, the joke's on Dave, but who's this fake friend of Lindsay? We're not sure, but we're guessing it's only a matter of time before Team Lohan starts blaming all her problems on the mystery person.