Britain's Queen Elizabeth II celebrates her 90th birthday on Thursday April 21, 2016 and several in the region are showing their well wishes.

To celebrate Britain's oldest and longest-serving monarch, burger chain "Burger King" rebranded for the day to "Burger Queen."

Royal fans are crowding the streets as they wait for the queen's walkabout donning placards, flags, celebratory hats and balloons.

Flip through the gallery above to see more of how Britain is celebrating Queen Elizabeth II's 90th birthday.

» Prince George joins royal family for queen's birthday portrait