1Idris Elba and fiancée Sabrina Dhowre
Getty ImagesIt's believed that Idris and Harry may have first met when he and Harry both attended a memorial service for Nelson Mandela at Westminster Abbey in March 2014.
2James Haskell and his fiancée Chloe Madeley
Getty ImagesAs Harry is an avid rugby fan and patron for the Rugby Football Union, it's no surprise that he and England rugby star James have become friends. James brought his fiancée Chloe Madeley with him to the service.
Advertisement - Continue Reading Below
3Tom Hardy and his wife Charlotte Riley
Getty ImagesTom and Harry have been pals since the actor became an ambassador for The Prince's Trust in 2010, which was founded by Prince Charles.
4Oprah Winfrey
Getty ImagesOprah is said to have spent a number of hours with Meghan's mother, Doria, in preparation for an interview they're doing together.
Advertisement - Continue Reading Below
5James Corden and his wife Julia Carey
Getty ImagesJames knows Harry because they've reportedly been on numerous boozy nights out in Mayfair together.
*hiccup*
6Carey Mulligan and her husband Marcus Mumford
Getty ImagesCarey knows Harry through her work for the War Child charity in the Congo. Her older brother has also served in the Army in Iraq and Afghanistan. Her husband Marcus Mumford – lead singer of Mumford and Sons – was probably invited not just as her plus one but due to his support for the One Campaign, which combats AIDS and poverty.
Advertisement - Continue Reading Below
7Cressida Bonas
Getty ImagesCressida is Harry's ex. Awkward.
8George and Amal Clooney
Getty ImagesGeorge and Amal are known for their charity work, so it's no great surprise that they're good friends with Harry and Meghan.
George's charity work focuses on human rights in the developing world. And Amal – a human rights lawyer – introduced Meghan to her hairdresser Miguel Perez, who has styled her hair for many of her public appearances before the wedding.
Advertisement - Continue Reading Below
9Serena Williams and her husband Alexis Ohanian
Getty ImagesSerena and Meghan have been close since at least 2014, when she nominated the tennis champ to take part in the Ice Bucket Challenge after they met at a charity football match.
10David and Victoria Beckham
Getty ImagesBecks has worked for the sort of charities Harry is involved in – including Unicef and the Elton John AIDS Foundation. Victoria will have rubbed shoulders with Meghan at fashion events, no doubt.
Advertisement - Continue Reading Below
11Pippa Middleton and her husband James Matthews
Getty ImagesPippa is Kate Middleton's sister aka Harry's sister-in-law.
12James Blunt and his wife Sofia Wellesley
Getty ImagesJames is friends with Harry because he was a captain in the Army before he became a famous singer. Like Harry, James supports charity work for veterans.
Advertisement - Continue Reading Below
13Joss Stone
Getty ImagesJoss knows Harry because she's an ambassador for the Sentebale charity Harry created to help AIDS orphans in Lesotho. She also sang at the Queen's Diamond Jubilee celebrations six years ago.
14Abigail Spencer and Priyanka Chopra
Getty ImagesAbigail stars in Suits alongside Meghan. And Priyanka is one of Meghan's closest friends. They met several years ago at the annual ELLE Women in Television dinner. "We bonded as actors," she said. "We just became friends, like two girls would."
Advertisement - Continue Reading Below
15Sarah Rafferty and her husband Santtu Seppälä
Getty ImagesSarah stars alongside Meghan in Suits.
16Patrick J Adams and his wife Troian Bellisario
Getty ImagesPatrick plays Meghan's husband in Suits. And he just so happens to be married to Pretty Little Liars star Troian IRL.
Advertisement - Continue Reading Below
17Rick Hoffman
Getty ImagesRick stars alongside Meghan in Suits.
18Gabriel Macht and his wife Jacinda Barrett
Getty ImagesGabriel stars alongside Meghan in Suits.
Advertisement - Continue Reading Below
19Gina Torres
Getty ImagesGina stars alongside Meghan in Suits.
20Elton John and his husband David Furnish
Getty ImagesSir Elton was incredibly close with Harry's mother Princess Diana.

Olivia Blair is Entertainment Editor (Luxury) at Hearst UK, working across ELLE, Esquire and Harper's Bazaar. Olivia covers all things entertainment and has interviewed the likes of Margot Robbie, Emma Stone, Michaela Coel and Ryan Gosling over the years.
Advertisement - Continue Reading Below
Advertisement - Continue Reading Below
Advertisement - Continue Reading Below