She was born in Kristiania as a daughter of Prime Minister Sigurd Ibsen.
[3] Irene Ibsen married Danish writer Steen Andersen Josias Christopher Bille (called Josias), a member of the ancient noble Bille family, in 1930, and moved to Denmark.
In the same year she issued the novel Det leende vindu ('The Laughing Window').
[4] Ibsen Bille had three children from two marriages: Suzanna (with first husband, Mario Rocco, the daughter was named Rosetta), and Anders and Joen (with second husband Josias).
Roughly a third of Henrik Ibsen's living descendants come from Irene's grandchildren and great-grandchildren.