Meredith Vieira (in-universe)

This News Anchor reported on the return of the Holy Roman Emperor to Buckingham Palace in an alternate timeline. (DW: The Wedding of River Song)

She presumably existed in the prime timeline as well.

Behind the scenes

 * Meredith Vieira, co-host of the American morning news/chat programme Today, filmed her cameo during a visit to the Upper Boat Studios as part of a profile of Doctor Who produced for Today. That feature, which aired on 9 May 2011, contained several minor spoilers for this episode, including revealing the cameo appearance by Richard Hope as Malohkeh.