From political figures to primary school children, Twitter was abuzz with tributes to Her Majesty as she celebrated her landmark birthday

The Queen today hosted a lunch at #BuckinghamPalace for all her Governors-General to mark #Queenat90 @ClarenceHouse
17,420 pieces of post arrived for The Queen this week, including birthday cards and gifts #Queenat90
Find out more about how The Queen will mark her 90th birthday...
The Queen's real birthday is 21 April but is officially celebrated in June with #TroopingtheColour #HM90facts
The Queen was born at 17 Bruton St on 21 April 1926 and christened on 29 May 1926 at Buckingham Palace #HM90facts