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21st April 2016
08:44am BST

A second photo depicts the Queen posing casually with her daughter Princess Anne in the White Drawing Room.
The final photo in the trio, an atmospheric outdoors shot, shows the monarch, hands in pockets, on the steps of the east terrace surrounded by her beloved corgis Willow, Vulcan, Holly and Candy.
Earlier this week the royal family released special card of commemorative stamps to mark the milestone birthday.
Prince George stole the limelight once again (on his first ever stamp!), beaming at the camera flanked by his great grandmother the Queen, his father Prince William and his grandfather Prince Charles.
The celebrations have been a real treat for royal watchers, who were also treated to this adorable footage of Prince Charles and a child in the BBC One documentary Elizabeth at 90 - A Family Tribute to be broadcast tonight at 9pm.
"He walks like George!" - The Duke of Cambridge and Prince Harry watch footage of their father as a child #Queenat90https://t.co/qSlZOjp5OP
— BritishMonarchy (@BritishMonarchy) April 20, 2016
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