While community heroes have been named among Prince Harry and Meghan Markle's wedding guests, neither prime minister Theresa May nor US president Donald Trump have been invited.
Opposition leader Jeremy Corbyn and Trump’s predecessor, Barack Obama, are also believed to be missing from the guest list.
The prince and his bride-to-be have chosen friends, colleagues and those they already know - rather than prime ministers and presidents - to join them at their wedding, which takes place on May 19 at St George's Chapel, in the grounds of Windsor Castle.
Barack Obama and wife Michelle have a warm relationship with the royal family, particularly Harry, and it is understood the royal couple will soon see the former president and First Lady, possibly during an official overseas trip following the wedding.
A Kensington Palace spokesman said: "It has been decided that an official list of political leaders - both UK and international - is not required for Prince Harry and Ms Markle's wedding.
"Her Majesty's Government was consulted on this decision, which was taken by the Royal Household."
Kensington Palace announced in March that 1,200 members of the public, including a 12-year-old schoolgirl caught up in the Manchester Arena bombing, would be among the crowds allowed to share the couple's day by watching the spectacle from the grounds of Windsor Castle.
The lucky group were nominated by the nine regional Lord Lieutenant offices after Harry and Meghan asked for those picked to come from a broad range of backgrounds and ages, including young people who have shown strong leadership, and those who have served their communities.