There's no denying that the Princess of Wales has a lovely relationship with her royal in-laws, particularly Prince William's cousin, Zara Tindall.
Since Princess Kate began dating the Duke during their university years, she and Zara appear to have developed a close bond and have been pictured chatting and laughing on several public occasions.
WATCH: Kate Middleton comforts Mia Tindall in sweet moment at Jubilee celebrations
The pair will have no doubt swapped wedding planning tips as the Cambridges and the Tindalls both tied the knot in 2011, and were guests at one another's nuptials. Kate and Zara have since become mothers with children of a similar age and the families have been spotted on playdates together.
William and Kate are parents to Prince George, eight, Princess Charlotte, seven, and four-year-old Prince Louis, while Zara and Mike have Mia, eight, four-year-old Lena and son Lucas, who was born in March 2021.
Take a look at the best photos of Kate and Zara's friendship through the years.
2007
Kate was spotted in the stands at the Concert for Diana in July 2007 signalling that she and William were back together after a brief break-up. While the royal girlfriend at the time wasn't sitting next to her Prince, Kate and William's cousin Zara were pictured having a catch-up.
SEE: 16 lovely photos that prove the royals have a close bond with their cousins
2012
When the late Queen celebrated her Diamond Jubilee in June 2012, William, Kate and Zara sat together as they enjoyed the special concert put on at Buckingham Palace.
2012
© Photo: Getty ImagesWhen Zara won a silver medal in the Eventing Team Jumping Final Equestrian event at the London 2012 Olympics, her family were there to cheer her on, including her BFF Kate, who waved and celebrated during the presentation.
SEE: 15 striking photos of royal history repeating itself
2013
© Photo: Getty ImagesZara made a beeline for Kate after the service to mark the 60th anniversary of the late Queen's Coronation at Westminster Abbey. The royal was heavily pregnant with her first child, Prince George, at the time and shortly after the event, Buckingham Palace announced that Mike and Zara were expecting their first baby, Mia. We wonder if they were swapping pregnancy tips?
2015
© Photo: Getty ImagesKate and Zara enjoyed a day out at the polo in Tetbury in June 2015 with their firstborn, George and Mia. The cousins were spotted hugging one another as they arrived at the match and Kate even matched her young niece in a striped top!
SEE: 11 times royal parents doted on their children: from Kate Middleton to Prince Harry
2017
© Photo: Getty ImagesWe would love to know what Zara said to Kate to make her react like this! The pair are often spotted giggling together and always seem to have fun at Royal Ascot. Princess Kate wore a white lace dress by Alexander McQueen for the occasion, while Zara looked lovely in an electric blue Escada ensemble.
READ: Princess Charlotte has the most adorable nickname for dad Prince William
2019
The friends looked delighted to see one another at the Easter Sunday church service in Windsor in 2019 and even their pastel-hued outfits complemented one another's outfits.
2019
© Photo: Getty ImagesOnce again, Kate and Zara were spotted laughing and chatting at the races in 2019, with lots of hugs and kisses on the cheek as they arrived. The royal ladies donned blue-toned dresses, with Kate wearing an Elie Saab number and Zara opting for a floral Zimmermann frock.
2021
© Photo: Getty ImagesZara and Mike showed their support for Kate as they attended her Christmas carol concert at Westminster Abbey in December 2021. The couple attended alongside the Countess of Wessex, Princess Beatrice and Edoardo Mapelli Mozzi and Princess Eugenie.
2022
Back in June Zara and Kate reunited at the late Queen's Platinum Jubilee Celebrations along with their respective broods. Dressed up to the nines, the families took their seats in the royal box to soak up the spectacular Pageant which saw the likes of Sir Cliff Richard take to the stage.
At various points during the awe-inspiring celebrations, Kate and Zara could be seen laughing hysterically before pausing for a more intimate catch-up. Perhaps they were discussing Prince Louis' hilarious antics...
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