Princess Kate ensured Prince Louis wasn't forgotten during Sunday's Wimbledon men's final, asking champion Jannik Sinner to sign an extra tennis ball for her youngest son, who stayed at home.
The Princess of Wales attended the match at SW19 with Prince William and their two eldest children, Prince George, 11, and Princess Charlotte, 10, watching from the Royal Box as Sinner defeated Carlos Alcaraz.
Following the Italian player's victory, the Waleses congratulated him courtside. Kate specifically requested three signed tennis balls, explaining to Sinner that they were "taking one for their brother" to prevent the seven-year-old from feeling left out.
The Princess kept her youngest son close to her heart through her choice of jewellery, wearing a £3,000 9ct gold pendant from Daniella Draper adorned with gemstones representing April's birthstone - the month Louis was born.
Prince Louis receives special gift after George and Charlotte attend Wimbledon without him.
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During their interaction with the new champion, footage captured George and Charlotte politely shaking hands with Sinner, telling him it was "very nice to meet you."
Kate laughed as she explained the extra tennis ball request, saying: "We're taking one for their brother," prompting William to add: "Louis will be upset otherwise."
The mother-of-three then offered her congratulations, telling Sinner: "Huge congratulations" whilst shaking his hand.
Kate has served as patron of the All England Lawn and Tennis Club since 2016, taking over the role from the late Queen Elizabeth II, who held the position for 64 years.
George and Charlotte receiving signed balls from Jannik Sinner.
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The Princess appeared radiant in a Roksanda blue dress for her second consecutive day at the All England Club, having presented the trophy at Saturday's women's final in a cream Self-Portrait look.
She wore her traditional "Wimbledon bow" - a green and purple brooch featuring the tournament's iconic colours, gifted to her by Queen Elizabeth II as a symbol of royal patronage.
Members of the Committee of Management wear the accessory during the tournament fortnight.
The Princess received a warm reception upon her arrival at Centre Court, with spectators giving her a standing ovation reminiscent of her appearance at last year's tournament.
George and Charlotte had stoic facial expressions following Alcaraz's loss at Wimbledon.
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George and Charlotte shook people's hands on arrival.
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Sunday's final saw Sinner triumph over two-time consecutive winner Alcaraz, with Princess Charlotte known to be a fan of the Spanish player.
On Saturday, Kate had consoled American player Amanda Anisimova following her 6-0, 6-0 defeat to Iga Swiatek in the most one-sided Wimbledon final since 1911.
The Princess placed her hand on Anisimova's arm, telling her to "keep your head high" after the match that lasted just 57 minutes.