Article continues below advertisementAndrew Mountbatten-Windsor, formerly known as Prince Andrew, and his ex-wife, Sarah Ferguson, reunited publicly for the first time since he lost all of his royal titles in October.Princess Beatrice's parents, who were married from 1986 to 1996, attended a private christening of their granddaughter Athena Mapelli Mozzi on Friday, December 12, at Chapel Royal at St James's Palace in London. Andrew, 65, and Sarah, 66, reportedly arrived separately and left the ceremony around noon, a news outlet reported.