Despite looking a little on the frail side, Prince Philip joined the annual celebrations in London today known as "Trooping the Color" to celebrate the Queen's official birthday.
The Duchess of Cambridge wore a chic silver-grey Erdem dress and daring Jane Corbett hat.
1,600 officers and soldiers in the traditional uniforms of the Household Cavalry, Royal Horse Artillery and Foot Guards took part in the magnificent parade in central London, to record crowds, evidence of a Jubilee spike in the monarchy's popularity.