Prince William at Winter Whites Gala

Prince William attends the Winter Whites Gala at Royal Albert Hall on Dec. 8, 2012, in London. The Duke of Cambridge attended the tennis gala in aid of the homeless charity Centrepoint, of which he is patron.

Prince William attends the Winter Whites Gala at Royal Albert Hall on Dec. 8, 2012, in London.

Prince William, right, smiles as he arrives at the Winter Whites Gala in aid of the Centrepoint charity at Royal Albert Hall in London on Dec. 8, 2012.

Prince William, accompanied by Centrepoint's Chief Executive Seyi Obakin, left, and Centrepoint trustee Danielle Alexandre, right, arrives at the Winter Whites Gala in aid of the Centrepoint charity at Royal Albert Hall in London on Dec. 8, 2012.

Prince William, right, speaks with tennis players Novak Djokovic, left, and John McEnroe during the Winter Whites Gala at Royal Albert Hall on Dec. 8, 2012, in London.

Prince William smiles as he meets people at the Winter Whites Gala in aid of the Centrepoint charity at Royal Albert Hall in London on Dec. 8, 2012.

Prince William, right, greets people from the homeless charity Centrepoint at the Winter Whites Gala at Royal Albert Hall in London on Dec. 8, 2012.

Prince William, right, is joined by Serbian tennis player Novak Djokovic, left, former player Boris Becker, top row second left, his wife, Lily, and Centrepoint trustee Danielle Alexandra in the Royal Box at the Winter Whites Gala in aid of the Centrepoint charity at Royal Albert Hall in London on Dec. 8, 2012.

Prince William, right, is joined by British actor Jude Law in the Royal Box at the Winter Whites Gala in aid of the Centrepoint charity at Royal Albert Hall in London on Dec. 8, 2012.

Britain's Tim Henman plays against Croatia's Goran Ivanisevic, not pictured, at the Winter Whites Gala, in aid of the homeless charity Centrepoint at Royal Albert Hall in London on Dec. 8, 2012.

Former tennis player Boris Becker, top left, reacts as Prince William, center, Centrepoint trustee Danielle Alexandra, left, and CEO Seyi Obakin, right, talk in the Royal Box at the Winter Whites Gala in aid of the Centrepoint charity at Royal Albert Hall in London on Dec. 8, 2012.

Prince William, Duke of Cambridge reacts during speeches at the Winter Whites Gala in aid of the Centrepoint charity at Royal Albert Hall in London on Dec. 8, 2012.

Prince William, right, prepares to make a speech at the Winter Whites Gala in aid of the Centrepoint charity at Royal Albert Hall in central London on Dec. 8, 2012.

Prince William, left, speaks alongside young people from Centrepoint at the Winter Whites Gala in aid of the homeless charity at Royal Albert Hall in London on Dec. 8, 2012.

Prince William, right, presents Serbian tennis player Novak Djokovic with the "Centrepoint Premier Award for Contribution to the Lives of Youth Accross the World" in recognition of his Novak Djokavic Foundation at the Winter Whites Gala, in aid of the Centrepoint charity, at Royal Albert Hall in London on Dec. 8, 2012.

Prince William poses with people from the homeless charity Centrepoint at the Winter Whites Gala at Royal Albert Hall in London on Dec. 8, 2012.