Camilla, Duchess of Cornwall, will be in attendance with other royals in the limited balcony line up for the Queen's Platinum Jubilee Trooping the Colour parade.
Some royal watchers say the limited line-up today is consistent with a longstanding desire by Prince Charles to slim down the monarchy.
The Queen, alongside her 73-year-old heir Charles and his wife Camilla, will be in attendance with Prince William, the second in line to the throne, with his wife Kate Middleton and their three children; and Charles’ siblings, Princess Anne and Prince Edward, along with their spouses.