The joyous event took place in the chapel inside Norway's Royal Palace on 17 April. The little Princess, who cried during much of the ceremony, wore the same christening gown that her late great-grandfather, King Olav V, wore in 1903, Aftenposten reports.
Speaking in front of around 300 invited guests, Oslo Bishop Gunnar Stålsett's declared it was a day of joy "that awakens warm feelings."
The baby princess, who as Crown Prince Haakon's first-born child stands to take over as reigning queen one day, was carried to the baptismal font by her grandfather King Harald, and she cried all through it.
Also present as godmothers were her aunt Princess Martha Louise, her maternal grandmother Marit Tjessem and Crown Princess Victoria of Sweden.
"Princess Ingrid Alexandra was the first to use King Olav's christening gown, which is made of nearly transparent cotton with lace and narrow silk ribbons. Its cap, however, was new and designed after the style of the time," Aftenposten writes.
"More than 200 of the christening guests, who included Norway's government ministers and a host of other dignitaries as well as family and friends, were invited to a luncheon at the palace immediately following the ceremony."