Tickets to a gala where Prince Harry and Meghan Markle will be receiving an award are selling for up to $1million (£847,000).
The Ripple of Hope ceremony in New York on December 6 honours individuals for their charitable efforts, and is set to be hosted by Kerry Kennedy - niece of John F. Kennedy.
The top-tier 'Pioneer' package includes four seats at the main table where the Duke and Duchess of Sussex are expected to be also seated.
Other packages cost $500,000 (£424,000) and include VIP reception access.
The event is organised by the Robert F. Kennedy Human Rights organisation.
Previous winners have included US President Joe Biden and ex-POTUSs Barack Obama and Bill Clinton, as well former Democratic hopefuls Hilary Clinton and Al Gore.
Hollywood actor and producer Alec Baldwin will oversee the gala.
Ukrainian leader Volodymyr Zelensky and Bill Russell, a basketball great and civil rights icon, will both also be honoured.
Four days earlier, Prince William and Kate Middleton will be in Boston attending the Earthshot prize.
It also has links to the Kennedys, with the Prince of Wales having teamed up with JFK's daughter Caroline to hand out five $1 million grants at the invitation-only do.
A source close to the event on December 2 told the MailOnline : "This is quiet wealth and power. Think Rockefellers and people like former Vice President Al Gore."
A wealthy LA-based heiress told the news outlet: "We love the Royals. I'd love to try to get tickets for both.
"You can buy a ticket to the Meghan event so that's no problem but the William and Kate event is strictly invitation only, which is making it much harder to get into."
