Prince Edward, the youngest son of Queen Elizabeth II, and his wife Sophie are expecting their second child some time in December.
News of the upcoming birth was revealed by a Buckingham Palace spokeswoman on Monday. Edward and Sophie, who hold the titles of Earl and Countess of Wessex, have a three-year-old daughter who bears the title Lady Louise.
Edward and Sophie were married in 1999.
The baby will be the eighth grandchild for Queen Elizabeth II and Prince Philip.