Demidova was born in Moscow, Russian SFSR, Soviet Union. She started dancing when she was just 6 years old in an after school program at the local community center, following in the footsteps of her older sister, world champion Katusha Demidova. At the age of fifteen Demidova won the British Open Junior Ballroom Championship and the Ireland Open Championship.After finishing high school in Moscow, Demidova moved to New York to live with her sister and pursue her dancing career. She began dancing with Andrei Begunov. After becoming the United States Youth Champions in 2005 and 2006, they represented the U.S. at the World Championships where they made the finals. They also placed 1st at the Ohio Star Ball, Kings Ball, Tri State Challenge, BYU Championship and many more competitions in the youth category.After her partnership with Andrey ended, Demidova started dancing with Igor Mikushov, with whom she won many competitions such as the Ohio Star Ball, Emerald Ball, Manhattan DanceSport Championship, Tri State Championship, and San Francisco Open. They were also Blackpool Dance Festival Under 21 ballroom finalists, United Kingdom Open finalists, and International Championship grand finalists.Practicing and teaching takes up most of Demidova's time, but in her spare time she has also taken up modeling, which she has been doing since she moved to New York 4 years agoShe was partnered with Michael Irvin for Season 9 of Dancing With the Stars. They were eliminated in the seventh week of the competition.Demidova has since returned to competition, reuniting with Andrei Begunov, premiering at the Manhattan Dancesport Championships, debuting as professionals, placing second in Rising Star International Standard.