Alex Kingston, who we all know as River Song, has been announced as another guest for the Florida Supercon 2012. This is Alex Kingston's first ever convention appearance in the US. As far as we know currently, she is the first and possibly only Doctor Who star to be at the convention (however there is always time for more to appear!). The convention is June 29th - July 2nd.
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Alex Kingston will also be appearing at The Eleventh Hour convention that's fast approaching alongside Matt Smith and numerous others.