Prince Harry and Meghan Markle attend tennis tournament as part of duke's birthday celebrations

The event benefited the Alliance for Children's Rights, honouring Kelly McKee Zajfen's late son.

The tournament, sponsored by the Sussexes' Archewell Foundation, featured a round-robin doubles competition and a luncheon to raise funds for young people in foster care.

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A post shared by Kelly McKee Zajfen (@_heartmom_)

Harry and Meghan were photographed posing with the Zajfen family on the tennis court, with the Duke sporting a white T-shirt and blazer, while the Duchess wore a tan button-up dress.

The couple exchanged hugs with Zajfen and engaged in conversations during the "incredible day".Kelly McKee Zajfen expressed her gratitude to the Sussexes in an Instagram post on Sunday, September 15.

She wrote: "To our Presenting Sponsors, The Archewell Foundation. Harry and Meghan, you have been such a guiding light for our family not just in the way you have shown up in friendship but how you have shown up through the incredible work The Archewell Foundation does everyday."

Zajfen added: "I'm in awe of your commitment to community and to friendship. On behalf of the Alliance for Children's Rights, we thank you. On behalf of our family, we love you."

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She also wished Harry a happy 40th birthday, saying: "Extra special day too…HAPPY 40th Birthday H! May this trip around the sun be the best yet."

The event raised funds to support children in foster care, ensuring they receive legal protections, resources, and opportunities.

Prince Harry recently reflected on entering his forties in a statement to the BBC. He said, "I was anxious about 30, I'm excited about 40."

The Duke emphasised his ongoing commitment to making a positive impact, stating, "Whatever the age, my mission is to continue showing up and doing good in the world."

The Duke's focus on fatherhood was evident in his comments to PEOPLE via a spokesperson.

He declared, "The best gift I've ever been given is, without doubt, my kids." The proud father added, "I enjoy watching them grow every single day and love being their dad."

The Duke highlighted how parenthood has influenced his perspective, saying, "Being a dad is one of life's greatest joys and has only made me more driven and more committed to making this world a better place."

Following his birthday celebrations, Harry is set to travel to New York City to work on projects close to his heart, including his mother Princess Diana's legacy award.