Britain was at its flag-waving best for the Queen's 90th birthday celebrations

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The celebrations for the Queen's 90th birthday began in a sea of colour under bright blue skies for her walkabout in Windsor.

Everyone was pretty excited as they lined the streets of her journey for the chance to catch a glimpse of, or even meet, Her Majesty.

Town criers (from the left) Steve Clow, Tony Appleton and Peter Baker join crowds outside Windsor Castle
(John Stillwell/PA)

A young boy joins the crowds as they gather outside Windsor Castle
(John Stillwell/PA)

Judy (left) and Anne Daley, from Wales, join crowds outside Windsor Castle
(John Stillwell/PA)

There were dogs on people's heads.

Royal fans gather with placards, flags and balloons as they wait for Britain's Queen Elizabeth II to start a walkabout
(Alastair Grant/AP/PA)

Squirrels on heads..we think?

A man with a colourful hat as crowds gather outside Windsor Castle
(Andrew Matthews/PA)

Corgis on cakes.

Queen birthday cake with a corgi
(John Stillwell/PA)

Sandra from Gogglebox was there.

Sandra Martin from TV show Gogglebox joins crowds outside Windsor Castle
(John Stillwell/PA)

And then the moment that everyone has been waiting for... the Queen arrived. Initially she waved to fans while flanked by the Duke of Edinburgh in the back of a Range Rover.

Queen Elizabeth II and the Duke of Edinburgh ride an open top Range Rover
(Steve Parsons/PA)

Queen Elizabeth II waves to well wishers
(Andrew Matthews/PA)

The Queen then met some of the hundreds of fans who had come out to meet her.

Queen Elizabeth II meets well wishers
(John Stillwell/PA)

Queen Elizabeth II meets well wishers
(John Stillwell/AP/PA)

Queen Elizabeth II meets well wishers
(John Stillwell/PA)

Great British Bake Off winner Nadiya Hussain baked a cake for the Queen. It was pretty impressive.

Queen Elizabeth II with Nadiya Hussain
(John Stillwell/PA)

The Queen accepted presents too.

The queen gets a 90th birthday present
(John Stillwell/PA)

As all of the merriment was going on in Windsor there were celebrations around Britain.

Officer Cadets from Tayforth Universities Officer Training Corp doffed their caps to the Queen after carrying out a 21-gun royal salute at Stirling Castle.

Officer Cadets from Tayforth Universities Officer Training Corp (UOTC) doff their caps to the Queen after carrying out a 21-gun royal salute
(Andrew Milligan/PA)

Officer Cadets from Tayforth Universities Officer Training Corp (UOTC) combined Pipes and Drums as a 21-gun royal salute is held to mark Queen's 90th birthday at Stirling Castle
(Andrew Milligan/PA)

And The King's Troop Royal Horse Artillery performed a 41 Gun Royal Salute at Hyde Park.

The King's Troop Royal Horse Artillery perform a 41 Gun Royal Salute
(Nick Ansell/PA)