She made her stage debut at the theatre in the role of Hilde in a 1998 production of Henrik Ibsen's The Lady from the Sea.

She has appeared in several productions of works by such Estonian authors and playwrights as: Anu Lamp, A. H. Tammsaare, Madis Kõiv, Jaan Tätte and Urmas Lennuk.

[2] Külli Teetamm made her television debut as the character of Pille Põder in 1997 in the long-running, popular ETV drama series Õnne 13.

This was followed in 2001 by the role of Laima in the Arvo Iho directed feature-length drama Karu süda (English release title: The Heart of the Bear).

[5][6] Külli Teetamm had been in a long-term relationship with actor Andero Ermel for many years and the two have two sons, Artur and Rasmus.