32 Times Kate Middleton and Prince Harry Got a Kick Out of Each Other

Although Kate Middleton has shared plenty of memorable moments with her other half, Prince William, over the years, she's also had some sweet and hilarious interactions with her brother-in-law, Prince Harry. He regularly has her laughing out loud when they attend events together, whether they're cracking up on the Buckingham Palace balcony or flashing big smiles in the stands. To make matters even cuter, Harry considers Kate "the big sister he never had." In an interview with Newsweek, the royal revealed that Kate, whom he refers to as "Cath," has helped him cope with the loss of his mother, Princess Diana. To get your royal-family fix, keep reading for a look at the duo's fun photos together, then check out the all-time best pictures of Prince William and Prince Harry.

Getty | MATT DUNHAM

In June 2016, Harry had Kate in stitches at a celebration for the Queen's 90th birthday.

Getty | Chris Jackson

Kate joked around with Harry when they watched the London Marathon in April 2017.

Getty | Matt Cardy

In June 2012, Prince Harry leaned in and Kate got the giggles during a Service of Thanksgiving at St. Paul's Cathedral in London.

Getty | LEON NEAL

The pair dressed up and shared smirks as they attended a London Commonwealth Service in March 2016.

Getty | Max Mumby/Indigo

Prince Harry cracked up when Kate danced with Paddington Bear at London's Paddington Station in October 2017.

Getty | WPA Pool

They made the cutest in-law duo during a visit to the Commonwealth Games village in Scotland in July 2014.

Getty | Max Mumby/Indigo

At the London launch of the Heads Together Campaign in May 2016, Kate and Harry shared a funny little moment together.

Getty | AFP

Prince Harry and Kate could barely keep it together as they channeled their inner wizards with Prince William at the Harry Potter set in April 2013.

Getty | Max Mumby/Indigo

Kate and Harry chatted as they made their way to the official opening of England's Global Academy in April 2017.

Getty | Chris Jackson

He had his sister-in-law grinning ear-to-ear when he joked around during the 2014 Trooping the Colour festivities.

Getty | Anwar Hussein

The pair shared a laugh during the service for the Most Noble Order of the Garter at St George's Chapel in June 2008.

Getty | Alex Moss

They shared a sweet moment when they greeted the Olympic Torch at Buckingham Palace in July 2012.

Getty | Max Mumby/Indigo

Prince Harry flashed a sweet smile at his sister-in-law when they attended a graduation ceremony in October 2017.

Getty | WPA Pool

Harry and Kate were all smiles at a Buckingham Palace tea party in London in May 2017.

Getty | Karwai Tang

She looked happy to be hanging out with Prince Harry and Prince William when they visited the Tower of London in August 2014.

Getty | Richard Heathcote

Kate and Prince William laughed alongside Prince Harry during the RBS Six Nations Championship match in London in February 2007.

Getty | Anwar Hussein

The pair smiled big during a dressed-up occasion in December 2011.

Getty | Samir Hussein

They goofed off together during a reception at the Grand Place in Mons, Belgium, in August 2014.

Getty | Chris Jackson

She was totally amused as Prince Harry spoke at a reception at Bacon's College in July 2012.

Getty | Max Mumby/Indigo

In June 2011, they were all smiles during Derby Day in Epsom, England.

Getty | WPA Pool

Prince Harry entertained his brother and sister-in-law during an official event in Windsor, England, in May 2012.

Getty | Pascal Le Segretain

She laughed while sitting with Prince Harry during the London 2012 Olympic Games.

Getty | AFP

Kate gave Prince Harry a sweet glance when they arrived at Mike Tindall and Zara Phillips's wedding in July 2011.

Getty | Chris Jackson

He leaned over and had Kate and Camilla, Duchess of Cornwall, laughing as the royal family stood on the Buckingham Palace balcony for Trooping the Colour in June 2013.

Getty | Chris Jackson

Both Will and Kate cracked smiles when Prince Harry chatted with them during the July 2014 Commonwealth games in Glasgow, Scotland.

Getty | ADRIAN DENNIS

Prince Harry and Kate chatted together in the stands during the closing ceremony of the 2012 Olympics.

Getty | Max Mumby/Indigo

She flashed a big grin at Prince Harry when they attended the Diamond Jubilee Thames River Pageant in London in June 2012.

Getty | WPA Pool

Kate and Prince Harry laughed along with Prince William when the group played a game with kids in October 2015.

Getty | Samir Hussein

In April 2017, the duo could not have look any more thrilled for the London Marathon.