Following her last statement about women no longer requiring men, you would think she would be be slightly more careful about what she was going to say live on TV. Nope, she decides to offend people by calling herself a retard.
Although it seems to have gone down well in the studio, it appears there were several groups of people who were offended by such a remark.
More on the story here.
How common is its use in the American language. Was she just be self-deprecating or was it an offensive use of the word?