Leah Isadora Behn, the daughter of Norwegian Princess Martha Louise, celebrates her 16th birthday. On the occasion of the birthday, Princess Martha Louise shared photos of her daughter and wished her a happy birthday. Leah Isadora was born on April 8, 2005 and she is the second daughter of Princess Martha Louise of Norway and late Ari Behn. Happy birthday to you, Leah Isadora Behn.