Along with Prince Harry and Meghan, the guest list is certifiably A-list, and includes the likes of Ivanka Trump and her husband, Jared Kushner, model Karlie Kloss and her husband, Joshua Kushner, singer Katy Perry and her fiancé, actor Orlando Bloom.
Princess Beatrice and Princess Eugenie are also expected to make an appearance.
Fashion designer Nonoo is widely believed to have been the person who set up Meghan with Prince Harry on a blind date.
Nonoo attended both Meghan’s wedding at Windsor Castle in May 2018 and her lavish baby shower at the Mark Hotel in February.
The Duke and Duchess of Sussex will be guests at the nuptials in Rome, before embarking on their much-anticipated tour of South Africa.
Their royal tour of the southern part of the continent stretches from September 23 to October 2, and they are bringing Archie along with them.