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AYRSHIRE, UNITED KINGDOM- MARCH 05: Catherine, Duchess of Cambridge, known as the Countess of Strathearn, and Prince William, Duke of Cambridge, known as the Earl of Strathearn, when in Scotland during a visit to Dumfries House on March 05, 2013 in Ayrshire, Scotland. The Duke and Duchess of Cambridge braved the bitter cold to attend the opening of an outdoor centre in Scotland today. The couple joined the Prince of Wales at Dumfries House in Ayrshire where Charles has led a regeneration project since 2007. Hundreds of locals and 600 members of youth groups including the Girl Guides and Scouts turned out for the official opening of the Tamar Manoukin Outdoor Centre. (Photo by Danny Lawson - WPA Pool/Getty Images)

AYRSHIRE, UNITED KINGDOM- MARCH 05: Catherine, Duchess of Cambridge, known as the Countess of Strathearn, and Prince William, Duke of Cambridge, known as the Earl of Strathearn, when in Scotland during a visit to Dumfries House on March 05, 2013 in Ayrshire, Scotland. The Duke and Duchess of Cambridge braved the bitter cold to attend the opening of an outdoor centre in Scotland today. The couple joined the Prince of Wales at Dumfries House in Ayrshire where Charles has led a regeneration project since 2007. Hundreds of locals and 600 members of youth groups including the Girl Guides and Scouts turned out for the official opening of the Tamar Manoukin Outdoor Centre. (Photo by Danny Lawson - WPA Pool/Getty Images)

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BARROW-IN-FURNESS, UNITED KINGDOM - APRIL 05: Catherine, Countess of Strathearn arrives at the Astute-class Submarine Building at BAE Systems on April 5, 2013 in Barrow-in-Furness, United Kingdom. The Duke of Cambridge is Commodore-in-Chief of the Royal Navy Submarine Service and during their visit they will tour the offices of Vanguard replacement programme and meet with the crew of Artful and their families, who are now based in Barrow. (Photo by Chris Jackson-Pool/Getty Images)

BARROW-IN-FURNESS, UNITED KINGDOM - APRIL 05: Catherine, Countess of Strathearn arrives at the Astute-class Submarine Building at BAE Systems on April 5, 2013 in Barrow-in-Furness, United Kingdom. The Duke of Cambridge is Commodore-in-Chief of the Royal Navy Submarine Service and during their visit they will tour the offices of Vanguard replacement programme and meet with the crew of Artful and their families, who are now based in Barrow.  (Photo by Chris Jackson-Pool/Getty Images)

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BARROW-IN-FURNESS, UNITED KINGDOM - APRIL 05: Catherine, Countess of Strathearn visits the Astute-class Submarine Building at BAE Systems on April 5, 2013 in Barrow-in-Furness, United Kingdom. The Duke of Cambridge is Commodore-in-Chief of the Royal Navy Submarine Service and during their visit they will tour the offices of Vanguard replacement programme and meet with the crew of Artful and their families, who are now based in Barrow. (Photo by Chris Jackson-Pool/Getty Images)

BARROW-IN-FURNESS, UNITED KINGDOM - APRIL 05:  Catherine, Countess of Strathearn visits the Astute-class Submarine Building at BAE Systems on April 5, 2013 in Barrow-in-Furness, United Kingdom. The Duke of Cambridge is Commodore-in-Chief of the Royal Navy Submarine Service and during their visit they will tour the offices of Vanguard replacement programme and meet with the crew of Artful and their families, who are now based in Barrow.  (Photo by Chris Jackson-Pool/Getty Images)

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BARROW-IN-FURNESS, UNITED KINGDOM - APRIL 05: Catherine, Countess of Strathearn visits the Astute-class Submarine Building at BAE Systems on April 5, 2013 in Barrow-in-Furness, United Kingdom. The Duke of Cambridge is Commodore-in-Chief of the Royal Navy Submarine Service and during their visit they will tour the offices of Vanguard replacement programme and meet with the crew of Artful and their families, who are now based in Barrow. (Photo by Chris Jackson-Pool/Getty Images)

BARROW-IN-FURNESS, UNITED KINGDOM - APRIL 05:  Catherine, Countess of Strathearn visits the Astute-class Submarine Building at BAE Systems on April 5, 2013 in Barrow-in-Furness, United Kingdom. The Duke of Cambridge is Commodore-in-Chief of the Royal Navy Submarine Service and during their visit they will tour the offices of Vanguard replacement programme and meet with the crew of Artful and their families, who are now based in Barrow.  (Photo by Chris Jackson-Pool/Getty Images)

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AYRSHIRE, UNITED KINGDOM - MARCH 05: Catherine, Countess of Strathearn, Prince William, Earl of Strathearn and Prince Charles, Duke of Rothesay during a visit to Dumfries House on March 05, 2013 in Ayrshire, Scotland. The Duke and Duchess of Cambridge braved the bitter cold to attend the opening of an outdoor centre in Scotland today. The couple joined the Prince of Wales at Dumfries House in Ayrshire where Charles has led a regeneration project since 2007. Hundreds of locals and 600 members of youth groups including the Girl Guides and Scouts turned out for the official opening of the Tamar Manoukin Outdoor Centre. (Photo by Danny Lawson - WPA Pool/Getty Images)

AYRSHIRE, UNITED KINGDOM - MARCH 05: Catherine, Countess of Strathearn, Prince William, Earl of Strathearn and Prince Charles, Duke of Rothesay during a visit to Dumfries House on March 05, 2013 in Ayrshire, Scotland. The Duke and Duchess of Cambridge braved the bitter cold to attend the opening of an outdoor centre in Scotland today. The couple joined the Prince of Wales at Dumfries House in Ayrshire where Charles has led a regeneration project since 2007. Hundreds of locals and 600 members of youth groups including the Girl Guides and Scouts turned out for the official opening of the Tamar Manoukin Outdoor Centre. (Photo by Danny Lawson - WPA Pool/Getty Images)