A reception honouring the Queen's Commonwealth essay competition brought together Queen Camilla and Geri Halliwell-Horner at St James Park on Thursday.
The gathering celebrated young writers who had tackled contemporary challenges, including environmental concerns, equality and youth leadership through their essays.
The former Spice Girl arrived wearing her characteristic cream-coloured attire, sporting a mid-length dress with button accents complemented by black court heels.
The author and singer warmly welcomed the Queen during the prize-giving event, where she mingled with competition winners.
Queen Camilla embraces Geri Halliwell-Horner decades after King Charles kiss
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Their encounter demonstrated the enduring connection between Mrs Halliwell-Horner and the Royal Family, a relationship spanning nearly three decades.
The pair exchanged an embrace during their meeting, with Queen Camilla remarking: "You've come back", to the former pop star.
This affectionate display echoed Mrs Halliwell-Horner's famously tactile approach to royal encounters, which has remained unchanged since the 1990s.
Following the ceremony, she praised the occasion as "the best literary event and best royal event of the year."
King Charles and Geri Halliwell-Horner pictured in 1997
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Her enthusiasm for the Commonwealth essay competition reflects her deep appreciation for royal initiatives, though this particular accolade might raise eyebrows given her longstanding involvement with the King's Trust events.
The warm reception between the two women highlighted their comfortable rapport and shared history.
Mrs Halliwell-Horner's royal connections trace back to 1997, when she famously broke protocol by patting the then-Prince Charles and kissing his cheek.
The monarch later described meeting the Spice Girls as "the second greatest moment in my life," before adding: "The greatest was the first time that I met them."
Royal Commonwealth Society Ambassador Geri Halliwell-Horner during a reception to celebrate the winners of the Queen's Commonwealth Essay Competition
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When Mrs Halliwell-Horner departed the group in 1998, Charles sent her a personal letter stating: "The group will not be the same without you."
He questioned: "What will I do without your wonderfully friendly greeting?" and expressed gratitude for her charitable contributions, signing off with "lots of love."
Mrs Halliwell-Horner serves as an ambassador for The King's Trust, formerly known as The Prince's Trust, maintaining her charitable involvement across decades.
Queen Camilla and Geri Halliwell-Horner at St James's Palace
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She regularly participates in trust events and actively promotes the organisation through media appearances.
The letter from 1998 specifically acknowledged her contributions, with Charles writing: "I really wanted you to know how deeply I've appreciated your great generosity to my Prince's Trust and how much I wish you well for whatever the future holds."
This enduring partnership demonstrates how a chance meeting between royalty and pop culture in the 1990s evolved into a lasting philanthropic relationship.