Autumn Kelly is anticipated to be among the guests when her former husband, Peter Phillips, marries NHS nurse Harriet Sperling at All Saints' Church in Kemble next month.
The ceremony, taking place near Cirencester, will embrace a more intimate countryside atmosphere rather than the grandeur typically associated with royal nuptials, reflecting Mr Phillips's preference for privacy.
Ms Kelly's expected presence at the wedding underscores what has become regarded as one of the monarchy's most successful examples of contemporary co-parenting following a high-profile separation.
The couple share two daughters, Savannah, 15, and Isla, 14.
The enduring connection between Ms Kelly and the Royal Family was evident earlier this month when she was spotted alongside Princess Anne at the Cirencester Horse Trials.
The pair appeared engrossed in conversation while watching Zara Tindall compete at the event.
This relaxed interaction highlighted the remarkably warm relationship Ms Kelly, 48, has preserved with her former in-laws since separating from Mr Phillips in 2019, with their divorce finalised in 2021.
Princess Anne, 75, has maintained a particularly strong bond with Ms Kelly over the years.
Ms Kelly and Mr Phillips first met at the 2003 Formula One Canadian Grand Prix, later marrying at St George's Chapel in Windsor in 2008.
Both have since found new partners, with Ms Kelly in a long-term relationship with Irish businessman Donal Mulryan.
Earlier this year, the former couple attended the Cheltenham Festival alongside their respective partners, with the group appearing entirely at ease throughout the racing event.
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This continued warmth represents a marked departure from previous generations of the monarchy, where former spouses typically faded quietly from public family life.
Ms Kelly has instead remained woven into the royal fold, particularly through shared interests in horses and country pursuits.
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