James, Viscount Severn was baptized in 2007.
James , Viscount Severn ( James Alexander Philip Theo Mountbatten-Windsor ; born 17 December 2007 ) is the younger child and only son of Prince Edward , Earl of Wessex , and Sophie , Countess of Wessex , and the youngest grandchild of Queen Elizabeth II and Prince Philip , Duke of Edinburgh . Sophie , Countess of Wessex , ( Sophie Helen ; née Rhys-Jones ; born 20 January 1965 ) , is the wife of Prince Edward , Earl of Wessex , the youngest son of Queen Elizabeth II and Prince Philip , Duke of Edinburgh .