Oslo's new bishop, Ole Christian Kvarme will lead the service and conduct the christening.
After the ceremony King Harald and Queen Sonja will host a private luncheon at the palace, according to an announcement on the palace web site.
Leah Isadora Behn is the second daughter of Princess Martha Louise and Ari Behn. She was born at home at the family's summer residence Bloksberg in Hankø on April 8.
Her elder sister Maud Angelica was also christened in the palace chapel, on the centenary of King Olav's birth, on July 2, 2003. Leah Isadora will likely wear the same christening robe as her sister and most of the other descendants of King Olav.
This robe was sewn by Princess Ingeborg in 1920 and was first used when King Harald's cousin Prince Georg of Denmark was christened.
Only heir apparent Ingrid Alexandra has used another christening robe, the robe of her great-grandfather King Olav, and which was used for the first time in over a century at her ceremony.
