What show hosted by Tom Bergeron did Anna Demidova perform on? 
Anna Demidova (dancer):  She is the winner of the professional dancer competition of "Dancing with the Stars", Season 8, which guaranteed her a spot as a professional dancer in Season 9 and has been featured in many popular magazines worldwide. Dancing with the Stars (U.S. season 8):  The show was again hosted by Tom Bergeron and Samantha Harris.
i don't know