The Princess of York, 36, welcomed her first child — a baby girl named Sienna — with her husband on Sept. 18, 2021.

Edoardo Mapelli Mozzi has revealed what his children call the Duchess of York. The 41-year-old became a father-of-three last week after the birth of his daughter, Athena Elizabeth Rose Mapelli Mozzi.

"Athena Elizabeth Rose Mapelli Mozzi," the property developer wrote on social media, posting the same photo that the palace shared. The shot showed the newborn raising a hand to her face while dressed in a white outfit, snuggled up in a pink blanket as someone held her.