A royal family album: Princes William and Harry

August 1982: The day of William 's christening at Buckingham Palace Photograph: Anwar Hussein/WireImage

August 1983: William with Diana during an official visit to Auckland, New Zealand Photograph: Anwar Hussein/WireImage

September 1984: Diana and Charles leave the St Mary's Hospital in London with Harry Photograph: Tim Graham/Getty Images

July 1986: William at Prince Andrew and Sarah Ferguson's wedding Photograph: Today/Rex Features

August 1986: William at Marivent Palace during a holiday in Majorca Photograph: Sipa Press/Rex Features

August 1986: Harry being carried by his mother on holiday in Majorca Photograph: Sipa Press/Rex Features

September 1989: Attending Charles Spencer's wedding to Victoria Lockwood Photograph: David Hartley/Rex Features

June 1989: William taking part in a gymkhana in Gloucestershire Photograph: David Hartley/Rex Features

July 1993: An early taste of military life for Harry at a British barracks in Germany Photograph: Martin Keene/PA

September 1995: William on his first day at Eton Photograph: Adam Butler/PA

September 1997: William walks behind the coffin of his mother, on its way to London's Westminster Abbey for the funeral Photograph: Ulli Michel/AP

September 1997: William and Harry bow their heads as Princess Diana's coffin is taken out of the abbey Photograph: Adam Butler/AP

September 1998: Harry on his first day at Eton Photograph: Rex Features/Rex Features

August 2001: William with supermodel Claudia Schiffer during a formal dinner at Highgrove Photograph: PA

April 2002: William on a local radio station in Chile during his gap year Photograph: Toby Melville/PA

November 2001: Harry playing the Eton wall game Photograph: Rex Features/Rex Features

November 2003: Harry takes a break from herding cattle in Queensland, Australia Photograph: Dave Hunt/EPA

September 2001: William and his father at St. Andrews University, where he read art history Photograph: Adam Butler/AP

March 2004: Harry planting a fruit tree in Lesotho during his gap year Photograph: Kieran Doherty/Reuters

July 2004: William running in a Sport Relief fund-raising event Photograph: Andrew Parsons/AP

June 2003: Harry celebrates the end of his A-levels Photograph: Toby Melville/Reuters

June 2005:Harry marches during a review parade at the Royal Military Academy Sandhurst Photograph: Matt Dunham/AP

July 2005: Harry plays polo in Cirencester Photograph: Chris Jackson/Getty

March 2006: Harry taking part in an exercise at the Royal Military Academy, Sandhurst Photograph: Crown Copyright/AP

July 2006: Harry and former girlfriend Chelsy Davy at a polo match in Windsor Photograph: Andrew Parsons/PA

August 2007: At the 10th anniversary commemoration of Diana's death Photograph: Lewis Whyld/AFP/Getty Images

13 March 2007: William with girlfriend Kate Middleton at the Cheltenham festival Photograph: Empics/PA

February 2008: Harry playing rugby during his tour of duty in Afghanistan Photograph: John Stillwell/PA

April 2008: William talking to an injured marine at Headley Court rehabilitation centre in Surrey Photograph: Tim Graham/Getty Images

May 2008: William in his Royal Navy uniform Photograph: John Stillwell/AP