Prince Harry, Prince William and Kate Middleton
Kate Middleton, the Duchess of Cambridge, sits with her husband Prince William (center) and Britain's Prince Harry at the 2014 Commonwealth Games in Glasgow, Scotland. Reuters

It may not be a royal wedding, but Charlies Gilkes’ upcoming nuptials will reportedly play host to three members of Britain’s royal family, the Duke and Duchess of Cambridge, Prince William and Kate Middleton, and Prince Harry.

Vanity Fair reports that Middleton, 32, will join her husband, Prince William, and brother-in-law Prince Harry, 29, in attending the wedding of Gilkes, a British nightclub owner and one of Britain’s former “most eligible” bachelors, and “PR girl” Anneke von Trotha Taylor in Italy in September.

“The Cambridges are really looking forward to it,” a pal told the magazine, confirming that the couple’s 13-month-old son, Prince George, will not be attending. “William and Kat are planning to leave Prince George with Kate’s parents so they can go and have a good time,” said the source.

While the exact details about the affair are being kept secret, Vanity Fair shares that the event’s planning, overseen by Trotha Taylor herself, is in “full swing” and that it will most likely be “lavish.”

Gilkes, founder and director of London hotspots Mr Fogg’s, Disco and Bunga Bunga, is reportedly a longtime friend of Britain’s royal family. Prior to his romance with Trotha Taylor, he was rumored to have dated Middleton’s 30-year-old sister, Pippa Middleton, in 2010. Gilkes was also previously linked to model Olivia Inge.

Last month the palace confirmed the Duchess will have her first solo royal tour this fall, traveling to Malta in September to celebrate the island’s 50 years of independence. "The trip will focus on some of the causes that connect with her beliefs and patronages,” a Middleton family source told Us Weekly of her upcoming two-day tour. “She’s really nervous but excited about being out by herself.”