Will and Kate's St. Patrick's Day

The Duke and Duchess of Cambridge marked St Patrick's Day by attending a ceremony in Aldershot on March 17.

The Duke And Duchess Of Cambridge Visit the 1st Battalion Irish Guards On St Patrick's Day

ALDERSHOT, ENGLAND - MARCH 17: Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge attend a St Patrick's Day parade by the 1st Battalion Irish Guards as they visit Aldershot Barracks on St Patrick's Day on March 17, 2013 in Aldershot, England. (Photo by Toby Melville - WPA Pool/Getty Images)

The Duchess Of Cambridge Attends the Irish Guards' St Patrick's Day Parade

ALDERSHOT, ENGLAND - MARCH 17: Prince William, Duke of Cambridge helps Catherine Duchess of Cambridge as her heel gets stuck in the grating during the Irish Guards' St Patrick's Day Parade at Mons Barracks on March 17, 2013 in Aldershot, England. (Photo by Antony Jones/UK Press via Getty Images)

The Duchess Of Cambridge Attends the Irish Guards' St Patrick's Day Parade

ALDERSHOT, ENGLAND - MARCH 17: Catherine, Duchess of Cambridge attends The Irish Guards St Patricks Day Parade, at Mons Barracks, where The Duchess presented the traditional sprigs of shamrock, on March 17, 2013 in Aldershot, England. (Photo by Mark Cuthbert/UK Press via Getty Images)

The Duchess Of Cambridge Attends the Irish Guards' St Patrick's Day Parade

ALDERSHOT, ENGLAND - MARCH 17: Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge attend The Irish Guards St Patricks Day Parade, at Mons Barracks, where The Duchess presented the traditional sprigs of shamrock, on March 17, 2013 in Aldershot, England. (Photo by Julian Parker/UK Press via Getty Images)

The Duchess Of Cambridge Attends the Irish Guards' St Patrick's Day Parade

ALDERSHOT, ENGLAND - MARCH 17: A general view of the 1st Battalion Irish Guards as Catherine Duchess of Cambridge and Prince William, Duke of Cambridge attend the Irish Guards' St Patrick's Day Parade at Mons Barracks on March 17, 2013 in Aldershot, England. (Photo by Antony Jones/UK Press via Getty Images)

The Duke And Duchess Of Cambridge Visit the 1st Battalion Irish Guards On St Patrick's Day

ALDERSHOT, ENGLAND - MARCH 17: A march is performed during The Irish Guards' St Patrick's Day Parade at Mons Barrackson March 17, 2013 in Aldershot, England. (Photo by Ben Pruchnie/Getty Images)

The Duke And Duchess Of Cambridge Visit the 1st Battalion Irish Guards On St Patrick's Day

ALDERSHOT, ENGLAND - MARCH 17: A march is performed during The Irish Guards' St Patrick's Day Parade at Mons Barrackson March 17, 2013 in Aldershot, England. (Photo by Ben Pruchnie/Getty Images)

The Duke And Duchess Of Cambridge Visit the 1st Battalion Irish Guards On St Patrick's Day

ALDERSHOT, ENGLAND - MARCH 17: Irish wolf hound Domhnalll marches during The Irish Guards' St Patrick's Day Parade at Mons Barrackson March 17, 2013 in Aldershot, England. (Photo by Ben Pruchnie/Getty Images)

The Duke And Duchess Of Cambridge Visit the 1st Battalion Irish Guards On St Patrick's Day

ALDERSHOT, ENGLAND - MARCH 17: Irish wolf hound Domhnalll marches during The Irish Guards' St Patrick's Day Parade at Mons Barrackson March 17, 2013 in Aldershot, England. (Photo by Ben Pruchnie/Getty Images)

The Duke And Duchess Of Cambridge Visit the 1st Battalion Irish Guards On St Patrick's Day

ALDERSHOT, ENGLAND - MARCH 17: Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge attend a St Patrick's Day parade by the 1st Battalion Irish Guards as they visit Aldershot Barracks on St Patrick's Day on March 17, 2013 in Aldershot, England. (Photo by Toby Melville - WPA Pool/Getty Images)

The Duke And Duchess Of Cambridge Visit the 1st Battalion Irish Guards On St Patrick's Day

ALDERSHOT, ENGLAND - MARCH 17: Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge attend a St Patrick's Day parade by the 1st Battalion Irish Guards as they visit Aldershot Barracks on St Patrick's Day on March 17, 2013 in Aldershot, England. (Photo by Toby Melville - WPA Pool/Getty Images)

The Duke And Duchess Of Cambridge Visit the 1st Battalion Irish Guards On St Patrick's Day

ALDERSHOT, ENGLAND - MARCH 17: Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge attend a St Patrick's Day parade by the 1st Battalion Irish Guards as they visit Aldershot Barracks on St Patrick's Day on March 17, 2013 in Aldershot, England. (Photo by Toby Melville - WPA Pool/Getty Images)

The Duke And Duchess Of Cambridge Visit the 1st Battalion Irish Guards On St Patrick's Day

ALDERSHOT, ENGLAND - MARCH 17: Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge attend a St Patrick's Day parade by the 1st Battalion Irish Guards as they visit Aldershot Barracks on St Patrick's Day on March 17, 2013 in Aldershot, England. (Photo by Toby Melville - WPA Pool/Getty Images)

The Duke And Duchess Of Cambridge Visit the 1st Battalion Irish Guards On St Patrick's Day

ALDERSHOT, ENGLAND - MARCH 17: Prince William, Duke of Cambridge attends a St Patrick's Day parade by the 1st Battalion Irish Guards as they visit Aldershot Barracks on St Patrick's Day on March 17, 2013 in Aldershot, England. (Photo by Toby Melville - WPA Pool/Getty Images)