Prince George and Princess Charlotte walk in Queen's funeral procession

London (CNN)- Prince George and Princess Charlotte played a special role at the state funeral of their late great-grandmother, Queen Elizabeth II, on Monday.

The two eldest children of the Prince and Princess of Wales formed part of a procession with the royal family, following the coffin as it entered London's Westminster Abbey.

Their attendance was confirmed by Buckingham Palace Sunday night with the release of the order of service for the event. The program listed the two Cambridge children, who are second and third in line to the British throne, among the royal procession behind the Queen's coffin.