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Catherine, Duchess of Cambridge attends a SportsAid Athlete Workshop at Queen Elizabeth Olympic Park on October 18, 2013 in London, England. (Photo by David Bebber - WPA Pool /Getty Images) ( 185199195 )

Britain's Kate, The Duchess of Cambridge plays volleyball during a visit to a SportsAid Athlete Workshop, at the Queen Elizabeth Olympic Park in London, Friday, Oct. 18, 2013. The Duchess of Cambridge as Patron of SportsAid attended a SportsAid Athlete Workshop at the Copper Box where she viewed young athletes taking part in a number of sports activities. (AP Photo/Kirsty Wigglesworth) ( Britain Royal )

Catherine, Duchess of Cambridge attends a SportsAid Athlete Workshop at Queen Elizabeth Olympic Park on October 18, 2013 in London, England. (Photo by David Bebber - WPA Pool /Getty Images) ( 185199198 )

Catherine, Duchess of Cambridge attends a SportsAid Athlete Workshop at Queen Elizabeth Olympic Park on October 18, 2013 in London, England. (Photo by David Bebber - WPA Pool /Getty Images) ( 185199193 )

Catherine, Duchess of Cambridge attends a SportsAid Athlete Workshop at Queen Elizabeth Olympic Park on October 18, 2013 in London, England. (Photo by David Bebber - WPA Pool /Getty Images) ( 185199207 )

Britain's Kate, The Duchess of Cambridge plays volleyball during a visit to a SportsAid Athlete Workshop, at the Queen Elizabeth Olympic Park in London, Friday, Oct. 18, 2013. (AP Photo/Kirsty Wigglesworth) ( Britain Royal )

Catherine, Duchess of Cambridge attends a SportsAid Athlete Workshop at Queen Elizabeth Olympic Park on October 18, 2013 in London, England. (Photo by David Bebber - WPA Pool /Getty Images) ( 185199199 )

Catherine, Duchess of Cambridge attends a SportsAid Athlete Workshop at Queen Elizabeth Olympic Park on October 18, 2013 in London, England. (Photo by David Bebber - WPA Pool /Getty Images) ( 185199202 )

Catherine, Duchess of Cambridge attends a SportsAid Athlete Workshop at Queen Elizabeth Olympic Park on October 18, 2013 in London, England. (Photo by David Bebber - WPA Pool /Getty Images) ( 185199208 )

Catherine, Duchess of Cambridge attends a SportsAid Athlete Workshop at Queen Elizabeth Olympic Park on October 18, 2013 in London, England. (Photo by David Bebber - WPA Pool /Getty Images) ( 185199209 )

Catherine, Duchess of Cambridge attends a SportsAid Athlete Workshop at Queen Elizabeth Olympic Park on October 18, 2013 in London, England. (Photo by David Bebber - WPA Pool /Getty Images) ( 185199201 )

Catherine, Duchess of Cambridge attends a SportsAid Athlete Workshop at Queen Elizabeth Olympic Park on October 18, 2013 in London, England. (Photo by David Bebber - WPA Pool /Getty Images) ( 185199210 )

Catherine, Duchess of Cambridge attends a SportsAid Athlete Workshop at Queen Elizabeth Olympic Park on October 18, 2013 in London, England. (Photo by David Bebber - WPA Pool /Getty Images) ( 185199216 )

Britain's Kate, The Duchess of Cambridge tours a sports hall during a visit to a SportsAid Athlete Workshop, at the Queen Elizabeth Olympic Park in London, Friday, Oct. 18, 2013. (AP Photo/Kirsty Wigglesworth) ( Britain Royal )

Britain's Kate, The Duchess of Cambridge plays volleyball during a visit to a SportsAid Athlete Workshop, at the Queen Elizabeth Olympic Park in London, Friday, Oct. 18, 2013. (AP Photo/Kirsty Wigglesworth) ( Britain Royal )

Britain's Kate, The Duchess of Cambridge waves as she leaves after a visit to a SportsAid Athlete Workshop, at the Queen Elizabeth Olympic Park in London, Friday, Oct. 18, 2013. (AP Photo/Kirsty Wigglesworth) ( Britain Royal )

Britain's Kate, The Duchess of Cambridge tours a sports hall during a visit to a SportsAid Athlete Workshop, at the Queen Elizabeth Olympic Park in London, Friday, Oct. 18, 2013. (AP Photo/Kirsty Wigglesworth) ( APTOPIX Britain Royal )

Britain's Kate, The Duchess of Cambridge laughs as she meets athletes during a visit to a SportsAid Athlete Workshop, at the Queen Elizabeth Olympic Park in London, Friday, Oct. 18, 2013. (AP Photo/Kirsty Wigglesworth) ( Britain Royal )

Britain's Kate, The Duchess of Cambridge plays volleyball during a visit to a SportsAid Athlete Workshop, at the Queen Elizabeth Olympic Park in London, Friday, Oct. 18, 2013. (AP Photo/Kirsty Wigglesworth) ( APTOPIX Britain Royal )

Britain's Kate, The Duchess of Cambridge, departs after attending a SportsAid Athlete Workshop, at the Queen Elizabeth Olympic Park in London, Friday, Oct. 18, 2013. (AP Photo/David Bebber, Pool) ( Britain Royal )

Britain's Kate, The Duchess of Cambridge waves as she leaves after a visit to a SportsAid Athlete Workshop, at the Queen Elizabeth Olympic Park in London, Friday, Oct. 18, 2013. (AP Photo/Kirsty Wigglesworth) ( Britain Royal )