LONDON (APP) – Thousands of people gathered for a special street party outside Buckingham Palace on Sunday to mark Queen Elizabeth the II’s 90th birthday.

Up to 10,000 people are expected to attend the Patron’s Lunch along with the monarch, her husband Prince Philip, Prince William and Prince Harry.

Tickets cost 150 pounds sterling (190 euros, $215) and most of the guests will be from organizations with which the queen has links.

The not-for-profit event was organized by the queen’s grandson, Peter Phillips, the son of Princess Anne.