Olga Tchakova, better known professionally as Olga Fonda, is a Russian-born actress and model from Ukhta, Russian SFSR, USSR.
She has modeled in Japan, Italy and the United States. Olga went on to appear in How I Met Your Mother, Nip/Tuck, Melrose Place, and Entourage, Little Fockers. She is best known for playing Nadia on the CW TV series The Vampire Diaries. Olga can currently be seen playing the role of Olga Petrovka on the TNT TV series Agent X.