Born in Moscow. Graduated from Moscow state conservatory named after P. I. Tchaikovsky in 1998. Since 1996 till 1998 worked on probation in Vienna musical academy with prof. I. Wamser.
On stage of Vienna state opera the singer performed parts of Asucena ("Il Trovatore", G. Verdi), Cerubino ("Le Nozze di Figaro", W. A. Mozart). In 1998 she debuted on stage of Czech National Opera in Brno, in premiere performances of "Carmen" (as Carmen) and "Samson and Dalila" (as Dalila).

More than once Ksenia participated in Sobinov festival (Saratov, Russia), Shalyapin festival (Kazan, Russian Federation). In 2000 together with "EURO STAGE" company the singer took part in international project of "Le Nozze di Figaro" production (as Cerubino).

In 2003 together with Italian producers Marco Boemi and Denis Krief (stage director) participated in premiere of "Nabucco" (as Fenena).

Ksenia Viaznikova recorded several CD-s with rarely performed chamber works of J. Brahms "Die schцne Magelone", "Vier ernste Gesдnge", as well as the symphonic poem by Berlioz "Romeo and Juliet". Russian channel "Kultura" made fund record of "Le Nozze di Figaro" where Ksenia performed Cerubino.

Ksenia Viaznikova is a laureate of several international vocalist contests: first prize at the Schubert contest, second priz at Pechkovsky contest ("Vocalists in Bolshoi"), a laureate of Rimsky-Korsakov contest. Laureate of the program "New names of the planet".

A member of ‘Helikon-Opera" troupe since 2003.

Tours: Great Britain, Israel, USA.

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