Prince William and Prince Harry's Cutest Moments Together Through the Years

Princes William and Harry have grown up in the spotlight, sharing more than a few sweet moments in front of the cameras over the years. From their early days standing on the Buckingham Palace balcony with the rest of the royal family to their later appearances with Kate Middleton, they regularly crack up together, sometimes exchanging funny glances during official events. Who could forget the time they channeled Harry Potter? Or the time Harry gave Will an adorable look in the middle of the royal wedding? In honor of Prince William's 34th birthday on Tuesday, keep reading for Prince William and Prince Harry's best moments together, then see Harry's best facial expressions.

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Young Will and Harry stood on the balcony of Buckingham Palace with the rest of the royal family after the Trooping the Colour ceremony in June 1989.

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Prince Harry and Prince William visited Niagara Falls with their mom, the late Princess Diana, in October 1991.

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In August 1995, Will and Harry stood between their parents for the commemorations of VJ Day.

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Prince William and Prince Harry took a walk with their dad on the Balmoral Estate in Scotland in August 1997.

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Prince Harry looked on with his parents, Prince Charles and Princess Diana, as Prince William signed in on his first day at Eton College in August 1997.

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Will and Harry suited up for the wedding of Sophie Rhys-Jones and Prince Edward in June 1999.

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The princes wore matching shirts when they participated in an exhibition polo match in Gloucestershire, England, in July 2001.

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The brothers sat in the Royal Box together for the June 2002 concert to commemorate Queen Elizabeth II's Golden Jubilee.

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The brothers had their arms around Prince Charles during a 2002 ski trip in Switzerland.

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In June 2003, Will and Harry stood side by side at the Calcot Manor Hotel polo cup.

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They stood together during the Trooping the Colour festivities in June 2003.

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Will and Harry shared a laugh at the Queen Mother's Cup in July 2004.

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They bundled up during the royal family's Switzerland ski trip in March 2005.

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In April 2005, Prince Harry and Prince William were all dressed up when Prince Charles tied the knot with Camilla, Duchess of Cornwall.

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Will gave his little brother a cute look when Prince Harry was commissioned as a Second Lieutenant at Sandhurst Military Academy in April 2006.

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Prince William cracked up when he sat between Prince Harry and his then-girlfriend Kate Middleton at the RBS Six Nations Championship match in London in February 2007.

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The princes sported matching hats for the Cavalry Old Comrades Association Annual parade in London in May 2007.

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Will and Harry stood up to do the wave during the July 2007 Concert For Diana at London's Wembley Stadium, which fell on what would have been the late Princess Diana's 46th birthday.

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In July 2007, Prince William and Prince Harry shared a laugh with Kanye West at the concert held in their late mother's honor.

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Prince William's beard was on full display when the brothers stepped out for the Christmas Day church service at St. Mary's Church in Sandringham, England, in December 2008.

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They flashed cute grins during a photocall at Royal Air Force Shawbury in June 2009.

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They sported their royal best as they stood with their grandmother Queen Elizabeth II during Trooping the Colour in June 2009.

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Will and Harry cracked up as they held an African rock python during a trip to Botswana in June 2010.

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The princes helped a little boy put gloves on during their visit to Lesotho in June 2010.

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In April 2011, Prince Harry walked along the aisle with Prince William moments before he tied the knot with Kate Middleton.

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Princes William and Harry looked dapper in bow ties when they attended The Sun Military Awards with Kate Middleton in London in December 2011.

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The pair pointed something out to Kate Middleton and their cousin Princess Beatrice during the Diamond Jubilee concert at Buckingham Palace in May 2012.

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Will and Harry stood and shouted alongside Kate during the 2012 London Olympic Games.

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Prince William, Prince Harry, and Kate Middleton channeled their inner wizards during an April 2013 visit to the Harry Potter set in north London.

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Prince Harry leaned in to chat with Will and pregnant Kate during the annual Trooping the Colour ceremony in June 2013.

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The pair goofed off while hanging out on the trading floor during the BGC Charity Day in London in September 2013.

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Prince Harry showed off his beard when they attended the Christmas Day church service at Sandringham in December 2013.

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The pair visited the Tower of London to check out the poppy installation commemorating the 100th anniversary of WWI in August 2014.

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Prince William showed his support for his younger brother at the Invictus Games in London in September 2014.

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Prince Harry had his arm around his older brother at the Audi Polo Challenge in Ascot, England, in May 2015.

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Prince Harry leaned in to chat with Prince William and his nephew, Prince George, during the Trooping the Colour festivities in June 2015.

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Prince William and Prince Harry got to work in September 2015, sporting matching hard hats while helping to renovate homes for veterans as part of the BBC series DIY SOS.

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Harry gave William a funny look while taking in the Rugby World Cup back in September 2015.

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In March 2016, William and Harry attended a celebration for the Queen's 90th birthday looking as handsome as ever.

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Back in April 2016, the men visited the set of Star Wars: Episode VIII.

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The duo took the polo field during the Audi Polo Challenge in May 2016.

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Harry and William were all smiles while attending a National Service of Thanksgiving with Kate Middleton in June 2016.

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Prince William and Prince Harry were completely upstaged by Harry's adorable children at the Trooping the Colour parade in 2016.