21st April is the Queen's 90th birthday - and she is still working and heading up the Royal Family. We take a look at the Queen's life in numbers...

1. The Queen was born Elizabeth Alexandra Mary at 2.40am on 21 April 1926. She was the first child of the Duke and Duchess of York, who went on to become King George VI and Queen Elizabeth.

PA Photos

2. At the time, she was third in line to the throne, behind her uncle Edward, Prince of Wales (who later became Kind Edward VIII) and her father.

3. In 1930, Princess Elizabeth became a big sister to Princess Margaret Rose.

4. Elizabeth’s father acceded the throne as King Geroge VI in 1937, following King Edward VIII’s abdication.

5. Elizabeth married Lord Mountbatten in Westminster Abbey in Novemeber 1947.

PA Pictures

PA Photos

6. On 6 February 1952, Elizabeth became Queen following the death of her father. Her official Coronation took place in Westminster Abbey on 2 June 1953.

7. Queen Elizabeth II celebrated her Diamond Jubilee in June 2012.

8. Whilst her actual birthday falls in April, Queen Elizabeth celebrates a second birthday on a Saturday in June, as is often the case when Sovereigns’ birthdays do not fall in the summer.

9. The Queen has sat for 129 portraits during her reign.

10. She has four children, eight grandchildren and five great-grandkids.

PA Photos

PA Photos

11. The Queen is head of state for 138 million people.

12. Queen Elizabeth’s reign has included 12 Prime Ministers.

13. During the first 60 years of her reign, the Queen had undertaken 261 official overseas visits, including 96 State Visits to 116 countries.

PA Photos

PA Photos

14. At 5.30pm on 9 September 2015, Queen Elizabeth II became the longest reigning British monarch. She surpassed Queen Victoria who spent 63 years, 7 months and 2 days (or 23,226 days) on the throne.