1/27Prince William (left) and Prince Harry (right) were both thrust into the spotlight from a young age, an experience that fortified their relationship to become something far beyond the typical brotherly bond. Here, we reflect on their long-running friendship.
2/27As tiny tots exploring their musical abilities at home in Kensington Palace under the watchful eye of their mother, Diana, Princess of Wales, in 1985.
3/27Harry (left) and Will (right) enjoying the spoils of the Kensington Palace playroom ages one and three, respectively, in 1985.
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4/27Reporting for duty during a visit to a police station in Windsor in 1987.
5/27The three musketeers take on the slopes of Lech, Austria, in their super-stylish sunglasses in 1991.
6/27Boys just wanna have fun, especially when accompanying their mum to Surrey's Thorpe Park theme park in 1993.
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7/27Two years older and wiser, William takes Harry through the official program for the 1995 anniversary celebrations of 'VJ Day', the day Imperial Japan surrendered to the Allies in World War Two.
8/27By each other's sides following the tragic death of their mother, the brothers sit in a limousine with their father, Prince Charles, as it follows the hearse carrying Princess Diana's coffin on the eve of her September 6 funeral in 1997.
9/27Taking in the immensity of the floral tributes left by the public for their late mother outside Kensington Palace in September 1997.
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10/27Spending time with their father at the Glenmuick hunting lodge on the family's Balmoral Estate in 1997.
11/27Engaging in a friendly staring contest as teenagers while at Highgrove House, the private residence of Prince Charles and Camilla, Duchess of Cornwall, in 1999.
12/27William, aged 21, and Harry, aged 18, cooling down after a competitive polo match in June 2003.
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13/27Arriving in their Sunday best for the civil ceremony of their father and Camilla Parker Bowles in April 2005.
14/27Sitting down with the BBC to talk about their mother on the 10th anniversary of her death in 2007. "We were left in no doubt at all that we were the most important thing in her life," William said at the time.
15/27The brothers front up to a helicopter training course in June 2009.
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16/27Spending time with HIV-affected children in Maseru, Lesotho, in 2010. Both brothers have long possessed a passion for charitable work.
17/27Harry being the annoying younger brother with the help of a rock python in Botswana in 2010. Harry spent some of the early days of his relationship with wife-to-be Meghan Markle camping in the African nation.
18/27Despite playing for opposing sides, the brothers shared a sportsmanlike handshake post-polo match in 2011 in Ascot.
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19/27Get me to the church on time: Harry performs his best man duties (aka remaining calm) on the way to Westminster Abbey for William's marriage to Kate Middleton on April 29, 2011.
20/27William and Harry (and Beatrice, Princess of York, and Kate) look on during the Queen's Diamond Jubilee at Buckingham Palace in 2012.
21/27Harry uses his wand to bewitch (read: amuse) William and Kate in the Diagon Alley portion of the <i>Harry Potter</i> set at Warner Brothers Studio in London in 2013.
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22/27Keeping each other entertained at a Business Leaders Employment meeting in London in 2014.
23/27William attempts to get a reaction out of his less-excitable younger brother during the England v Wales match at the Rugby World Cup in 2015.
24/27Harry leaves William and Kate in his dust during a training run for their Heads Together charity at London's Olympic Park in February 2017.
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25/27Getting in the marital mood at Pippa Middleton and James Matthews' wedding at St Mark's Church in Berkshire on May 20, 2017.
26/27William shares a sweet moment with his brother's fiancee, Meghan Markle, arriving at an Anzac Day service at Westminster Abbey on April 25, 2018.
27/27The Royal Mint has unveiled the coin ahead of the Duke of Cambridge's milestone birthday on June 21.
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