The Duke and Duchess of Sussex had only previously released a photo of their daughter, Lilibet "Lili" Diana Mountbatten-Windsor, in a Christmas card.
Mapelli Mozzi already has a son, Christopher Woolf, from a previous relationship.
Joanna Toch is under internal review for "unacceptable" tweets she wrote about "black names" that mocked the Black Lives Matter movement.
The Duke and Duchess of Sussex are expecting their second child together.
The Duke and Duchess of Sussex said Sunday that they are "overjoyed to be expecting their second child."
The Duke and Duchess of Sussex are going to be parents again!
The way Eugenie announced her son's birth suggests she's taking notes from Prince Harry and Meghan Markle.
The Duke of Sussex could barely hold it together during the emotional moment.
He has accused the Duke and Duchess of Sussex's PR team of trying to "ghost" him.
The Duke and Duchess of Sussex welcomed Archie Harrison Mountbatten-Windsor last week.