His son, Prince William, the Duke of Cambridge, is next in line, followed by his children, George, Charlotte and Louis.
Harry, the Duke of Sussex is currently at number six, and his son Archie is number seven.
Prince Andrew, the Duke of York, is eighth in line, followed by his daughter Princess Beatrice of York, and finally, Princess Eugenie of York.
And it may not be too long until Eugenie finds herself off the list.
While no official pregnancy announcements have been made the British royal family, Princess Charlotte shocked her classmates by revealing that her mum, the Duchess of Cambridge, is expecting again.
According to a royal insider, Charlotte “let the cat out of the bag”, with the 4-year-old telling everyone that her “mummy is having another girl”.
“One of the teaching aides overheard Charlotte saying it and couldn’t believe her ears –Charlotte was talking very loudly, and seemed convinced that her mummy was pregnant,” the source reveals.
“It was certainly quite the bombshell to drop in her first week of school!"