PICTURES: Britain Celebrates Queen's 90th Birthday

Britain celebrates today as Queen Elizabeth II turns 90. Although her birthday will not be officially celebrated until June, Brits still gathered outside Windsor Castle, where she is currently in residence, to send their best wishes.

Buckingham Palace released three official photographs of the Queen with her family.

Queen's 90th birthday celebrations - EMBARGOED UNTIL 00:01 BST THURSDAY APRIL 21, 2016.

The Queen and her daughter Princess Anne, the Princess Royal

The Queen and her corgis on the steps of Windsor Castle

The Queen with her five great-grandchildren and two youngest grandchildren. The children are: James, Viscount Severn (left), 8, and Lady Louise (second left), 12, the children of The Earl and Countess of Wessex; Mia Tindall (holding The Queen’s handbag), the two year-old-daughter of Zara and Mike Tindall; Savannah (third right), 5, and Isla Phillips (right), 3, daughters of The Queen’s eldest grandson Peter Phillips and his wife Autumn; Prince George (second right), 2, and in The Queen’s arms and in the tradition of Royal portraiture, the youngest great-grandchild, Princess Charlotte (11 months), children of The Duke and Duchess of Cambridge on April 20, 2016.

Some Brits were somewhat less formal in their celebrations, however.

<> at on April 20, 2016 in Windsor, England.

A woman gets into the spirit of the Queen’s 90th Birthday in novelty glasses outside Windsor Castle (Chris Jackson/Getty Images)

The Queen & Duke Of Edinburgh Carry Out Engagements In Windsor

A royal ‘super-fan’ waits with his patriotically dressed dogs (Chris Jackson/Getty Images)

(CHRIS JACKSON/AFP/Getty Images)

(JUSTIN TALLIS/AFP/Getty Images)

(JUSTIN TALLIS/AFP/Getty Images)

(Chris Jackson/Getty Images)

(JUSTIN TALLIS/AFP/Getty Images)

Lianne Holmes and Michelle Lowe who have been camping outside Windsor Castle all night wait in position for the Queen’s 90th Birthday Walkabout (Chris Jackson/Getty Images)