The two Princes are all now grown up and married, but here's a Royal trip down memory lane to when they were just both just young lads!
1. Princes William and Harry with Princess Diana
The young princes applaud during a Wales V France Five Nations Cup match, alongside their late mother.
2. Prince Harry and Prince William try surfing in Nevis
Princess Diana encourages her youngsters to enjoy the sea on a family holiday to Nevis.
3. Prince Harry and Prince William on duty
Prince Harry and Prince William share a chat during the VJ Day parade march.
4. Prince Harry and Prince William view flowers outside Kensington Palace
Harry and William view the sea of flowers outside Kensington Palace left for their late mother, Princess Diana.
5. Prince Harry actually makes Posh Spice smile
Prince Harry achieves the unachievable and causes Posh Spice to smile in Johannesburg, whilst Charles fends off Sporty.
6. Prince William on his mission to repair walkways in Southern Chile
The young Prince helps the village of Tortel in Southern Chile by repairing walkways.
7. Prince Harry and Prince William enjoy the Mexican Wave
The young princes perform the Mexican Wave during the Queen's Golden Jubilee celebrations.
8. Prince Harry and Prince William take part in a Polo match
The teenage Princes line up to take part in a Polo match.
9. Princes Harry and William with their father, Prince Charles, on a ski trip
Harry and William enjoy a ski trip in Klosters, Switzerland, with their father.
10. Prince Harry holds Spike the Echidna during his sabbatical
Prince Harry winces in pain as he holds the aptly named Spike.
11. Prince William chills on the beach at St Andrew
Wills kicks off his shoes and enjoys some beach time during his Uni days.
12. Prince Harry takes part in the 'Wall Game' at Eton College
The young flame haired Royal enjoyed sports at college.
13. Prince Harry pops some toast at college
Eton college student Harry gets to grips with a toaster in between his studies.
14. Prince Harry stars in Much Ado About Nothing at Eton
Harry gets into character as he takes to the stage in an Eton College performance.
15. Prince Harry and Prince William enjoy a joke after the Christmas Day service at Sandringham
Harry and Wills are in good spirits following the Christmas Day service in 2003.
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