Two future monarchs are set to pay tribute to Queen Elizabeth at a special concert in front of Buckingham Palace.

This is the third day of the Platinum Jubilee extravaganza marking Elizabeth’s 70 years on the throne.

Prince Charles and Prince William, the queen’s son and grandson, are scheduled to address a live audience of 22,000 people and millions more watching on television.

The event featuring Diana Ross, Queen + Adam Lambert and Alicia Keys will take place in a temporary amphitheater built around the Victoria Memorial outside the palace.