LONDON, ENGLAND - JUNE 11: Catherine, Duchess of Cambridge makes her way down the Mall during the Trooping the Colour procession on June 11, 2011 in London, England. The ceremony of Trooping the Colour is believed to have first been performed during the reign of King Charles II. In 1748, it was decided that the parade would be used to mark the official birthday of the Sovereign. More than 600 guardsmen and cavalry make up the parade, a celebration of the Sovereign's official birthday, although the Queen's actual birthday is on 21 April. (Photo by Dan Kitwood/Getty Images)
Her first stop of the day was the Trooping the Colour to mark Queen Elizabeth II's 85th birthday. For the event, which included a royal family gathering on the Buckingham Palace balcony, the new Duchess of Cambridge wore a black hat and an ivory Alexander McQueen .
She wore the same hat later in the day when she joined her sister, Pippa, for the wedding of Cheltenham Gold Cup winner Sam Waley-Cohen. She paired it with a black-and-white patterned dress which she wore several years ago on a nightclub outing with Pippa.
She added a thin black belt for a more modern look as well as a black clutch and heels.
Pippa also wore a black and white dress and a black hat, to which she added a light green coat.