She made her debut at Den Nationale Scene in Bergen in 1929, and in the 1930s at the Carl Johan Theater and Scala Revyteater in Oslo.

Kirsten Heiberg also performed in several Norwegian and Swedish films in the early 1930s and had her breakthrough in the comedy Han, hon och pengarna ("He, she and the money") in 1936.

After guest appearances in the operetta revue "Pam-Pam" at Theater an der Wien in 1937, she began a career in Germany both as a film actress and recording artist.

In Vienna, she met the composer Franz Grothe, who was a member of the Nazi Party[5] They married in Oslo in 1938 and moved to Berlin.

On the contrary, Kirsten Heiberg's name can be found on the salary lists of the German film industry every year from April 1940, when she got her Reichsfilmkammer membership, until 1945.

[8] Kirsten Heiberg continued to act in the German Nazi propaganda until she left Berlin with her husband Franz Grothe at the end of April 1945.

In Trondheim, she got an engagement as a resident at Trøndelag Teater 1952–60, acting in operettas, comedies, and serious classics and modern dramas.