Prince William and Kate visit Scotland

Prince William and his wife, Kate, visit the Emirates Arena on April 4, 2013, in Glasgow, Scotland. The Duke and Duchess of Cambridge are on a two-day visit to Scotland, where they are known as the Earl and Countess of Strathearn.

Prince William greets crowds as he visits the Emirates Arena on April 4, 2013 in Glasgow, Scotland. The Emirates Arena will play host to several events at the 2014 Glasgow Commonwealth Games.

Kate, Duchess of Cambridge, watches a sports demonstration as she visits the Emirates Arena on April 4, 2013, in Glasgow, Scotland.

Prince William and Kate, Duchess of Cambrdige, visit the Emirates Arena on April 4, 2013, in Glasgow, Scotland.

Kate, Duchess of Cambrdige, and Sadie Docherty, Lord Provost for Glasgow, watch a sports demonstration as they visit the Emirates Arena on April 4, 2013, in Glasgow, Scotland.

Kate, Duchess of Cambrdige, watches a sports demonstration as she visits the Emirates Arena on April 4, 2013, in Glasgow, Scotland.

Prince William and Kate, Duchess of Cambridge, look on as 2014 Glasgow Commonwealth Games mascot Clyde runs around the track during their visit to the Emirates Arena on April 4, 2013, in Glasgow, Scotland.

Prince William and his wife Kate, the Duchess of Cambridge, applaud during their visit to the Emirates Arena in Glasgow, Scotland, April 4, 2013.

Prince William and his wife Kate, the Duchess of Cambridge, visit the Emirates Arena in Glasgow, Scotland, April 4, 2013.

Kate, Duchess of Cambridge, and Sadie Docherty, Lord Provost for Glasgow, talk to children after a sports demonstration as they visit the Emirates Arena on April 4, 2013, in Glasgow, Scotland.

Kate, Duchess of Cambridge, is seen during her visit to the Emirates Arena on April 4, 2013, in Glasgow, Scotland.

Kate, Duchess of Cambridge, greets the crowd as she visits the Donald Dewar Leisure Centre to launch a new project on April 4, 2013, in Glasgow, Scotland. The Royal Foundation of The Duke and Duchess of Cambridge and Prince Harry is partnering with Glasgow Sport and the Hunter Foundation on a new pilot as part of its national Coach Core initiative.

Prince William greets the crowd as he visits the Donald Dewar Leisure Centre on April 4, 2013, in Glasgow, Scotland.

Kate, Duchess of Cambridge, visits the Donald Dewar Leisure Centre on April 4, 2013, in Glasgow, Scotland.

Prince William participates in a hockey demonstration as he visits the Donald Dewar Leisure Centre to launch a new project on April 4, 2013, in Glasgow, Scotland.

Kate, Duchess of Cambridge, plays basketball at the Donald Dewer Leisure Centre on April 4, 2013, in Glasgow, Scotland.

Kate, Duchess of Cambridge, plays table tennis against Prince William during a visit to the Donald Dewer Leisure Centre in Glasgow, Scotland on April 4, 2013.

Prince William plays table tennis against his wife, Kate, Duchess of Cambridge, during a visit to the Donald Dewer Leisure Centre in Glasgow, Scotland, on April 4, 2013.

Kate, Duchess of Cambridge, Prince William and Prince Charles visit Dumfries House on April 5, 2013, in Ayrshire, Scotland. The Duke and Duchess of Cambridge braved the bitter cold to attend the opening of an outdoor center 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 Manoukian Outdoor Centre.

Kate, Duchess of Cambridge, is shown a doll of herself by Dayna Miller as she stops to talk to some school children during a visit to Dumfries House on April 5, 2013, in Ayrshire, Scotland.

Prince William and Kate, Duchess of Cambridge, visit Dumfries House on April 5, 2013, in Ayrshire, Scotland.

Prince Charles, Kate, Duchess of Cambridge, and Prince William visit Dumfries House on April 5, 2013, in Ayrshire, Scotland.

Kate, Duchess of Cambridge, is seen during a visit to Dumfries House on April 5, 2013, in Ayrshire, Scotland.

Prince Charles, accompanied by his son Prince William and Kate, Duchess of Cambridge, officially open the Tamar Manoukian Outdoor Centre during a visit to Dumfries House on April 5, 2013, in Ayrshire, Scotland.

Prince William and Kate, Duchess of Cambridge, are greeted by Rear-Admiral Simon Robert Lister and Commander Steve Garrett as they visit 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 program and meet with the crew of Artful and their families, who are now based in Barrow.

Prince William reveals a plaque to commemorate the opening of the Future Submarines Offices during his visit to the Astute-class Submarine Building at BAE Systems on April 5, 2013, in Barrow-in-Furness, United Kingdom.

Kate, Duchess of Cambridge, talks to Maizie Yeardley during a visit the Astute-class Submarine Building at BAE Systems on April 5, 2013, in Barrow-in-Furness, United Kingdom.

Prince William talks to members of the crew during a visit the Astute-class Submarine Building at BAE Systems on April 5, 2013, in Barrow-in-Furness, United Kingdom.

Kate, Duchess of Cambridge, talks to members of the crew as she visits the Astute-class Submarine Building at BAE Systems on April 5, 2013, in Barrow-in-Furness, United Kingdom.

Prince William and Kate, Duchess of Cambridge, visit the Astute-class Submarine Building at BAE Systems on April 5, 2013, in Barrow-in-Furness, United Kingdom.