Kate Gosselin

The Today show cast, on Tuesday, previewed a guest appearance by reality show star Kate Gosselin on Sarah Palin's TLC show, and after showing a clip of the former Alaska Governor frightening the celebrity mother of eight kids by firing off a gun, Vieira revealed she shared Gosselin's fears as she yelped: "You're with a woman with a gun. The whole thing makes me nervous, you know?" The…