Turns out Levi Johnston doesn't have a Twitter account, much to Conan O'Brien's consternation.

The Tonight Show host offered an apology to Sarah Palin's Wasilla nemesis after learning that the Twitter account from which William Shatner recited tweets on Wednesday night's show was created by an imposter. Made out of loin whole cloth, as it were.

WebNewser earlier today featured the Shatner segment in a video. Sadly, the clip, like many things in the media today, was entertaining but not based on fact. Here's O'Brien from last night's show:

"We'd been following Levi on Twitter and felt his gift for the written word needed to be shared with the world," he explained. "Today...I got some shocking news: Apparently the tweets that we read are counterfeit. They were written by a clever imposter posing as the witty Levi Johnston. And the real Levi is very angry with us."

"I would like to personally apologize to Levi Johnston and his lawyer and publicist for misrepresenting him in any way," he continued.

No doubt this pains the former Alaska governor even more than it does O'Brien, who, in retrospect, shouldn't have crossed swords with the pending Playgirl pin-up. WebNewser is trying to confirm rumors that, as part of an out-of-court settlement, O'Brien will have to "whip it out" on tonight's show.