David Cameron and Jeremy Corbyn have led tributes to the Queen in the House of Commons as MPs marked her 90th birthday.
Opening a special "Humble Address", the PM said she had led a "gentle evolution" of the monarchy during her 64-year reign.
Labour leader Jeremy Corbyn said whatever people's views on the monarchy, the "vast majority" agreed she had served her country.
UK-wide celebrations are taking place.
Crowds lined the streets in Windsor as the monarch took part in a walkabout, after royal gun salutes were fired from each of the UK's capital cities.
Mr Cameron paid tribute to her "extraordinary service", which he said was "a joy for us all to celebrate, to cherish and to honour".
Thursday, 21 April 2016
BBC News: Queen's 90th birthday: Cameron and Corbyn lead tributes