Anne, who turned the milestone age on August 15, has two biological children, Peter and Zara, from her first marriage to Captain Mark Phillips; they married in 1973 and divorced in 1992. That same year, Anne married Vice Admiral Sir Timothy Laurence, but he has no children, and, therefore, Anne has no stepchildren.

Princess Kate and Prince William joined the wider Royal Family in celebrating Princess Anne’s 75th birthday on Friday. On their official social media accounts, the Prince and Princess of Wales shared a new portrait of the Princess Royal with the message: "Wishing Her Royal Highness The Princess Royal a very Happy 75th Birthday!