"The best Gigi," Princess Beatrice's husband Edo wrote below the post Sarah Ferguson is reveling in becoming a grandmother again. On Jan. 29, the Duchess of York, who is popularly known as Fergie, was among the first to celebrate the news that her daughter Princess Beatrice has welcomed a baby girl.

Following the birth of Princess Beatrice's baby daughter Athena, the Duchess of York's son-in-law revealed the sweet name her grandchildren use to address her. Athena Elizabeth Rose Mapelli Mozzi was born on Wednesday, January 22 at Chelsea and Westminster Hospital in London, a few weeks ahead of her expected early spring arrival.

Princess Beatrice and Edoardo Mapelli Mozzi's new daughter has been named Athena Elizabeth Rose, with her unusual moniker and place in the line of succession now being explained