Serena Williams and Meghan Markle - The Duchess of Sussex and the tennis player met at a Super Bowl party in 2010, and they hit off right away. Williams allegedly organized Meghan's lavish baby shower, and paid for a US$75,000-a-night penthouse. Meanwhile, we can't even get a text back from our friends!

2 / 28 Fotos

Michelle Obama and Prince Harry - Prince Harry befriended the Obamas when they first met in Washington, D.C. in 2015. In 2017, Barack Obama invited him personally to speak at the Obama Foundation's Summit. He also joined the president's wife on a school visit as part of the Obama Presidential Care. The FLOTUS later thanked him on Twitter by saying: "Thanks to my friend Prince Harry for joining me in my hometown to surprise these outstanding students!"

3 / 28 Fotos

Prince Charles and Rod Stewart - The two men have known each other for decades. The pop star serves as an ambassador to The Prince's Trust, Prince Charles' charity foundation.

4 / 28 Fotos

Gerard Butler and Charlène of Monaco - Scottish actor Gerard Butler is a long-time friend of Grace Kelly's daughter-in-law. He was also invited to her wedding with Prince Albert II of Monaco in 2011.

5 / 28 Fotos

Tom Hardy and Prince Harry - Tom Hardy has spoken about his friendship with Prince Harry in an interview, saying that his friendship with the Duke of Sussex was "deeply private." They have been friends since 2010, after the actor became an ambassador for The Prince's Trust.

6 / 28 Fotos

Amal Clooney and Meghan Markle - "Meghan and Amal have known each other for a while and share many interests," said an anonymous source to People. "Amal has been helping Meghan settle into London life. It was a very natural friendship from day one."

7 / 28 Fotos

Queen Rania and Nicole Kidman - Nicole Kidman reportedly met the Jordanian queen for the first time at a luncheon, and they clicked immediately. She was also among the few celebrities who were invited by Queen Rania on a three-day tour of Jordan, to share in the beauty of her country.

8 / 28 Fotos

Abigail Spencer and Meghan Markle - Fellow actress Abigail Spencer and Meghan Markle have known each other long before Markle became famous. They met on an audition, and years later co-starred in the TV series 'Suits.' Spencer told ET: "We were born on the same day, hours apart, in the same year," she said. "[Meghan is] a trusted friend and one of the most glorious people I have ever met."

9 / 28 Fotos

David Beckham and Prince William - David and Victoria Beckham are good friends with the British royal family. The former professional soccer player is often seen at tennis tournaments or soccer games with Prince William.

10 / 28 Fotos

Elton John and Princess Diana - The friendship between the singer and "The People's Princess" goes way back. In an interview with a British newspaper, the composer opened up about his tumultuous friendship with Princess Diana: "She was a controversial figure in some respects, but not to me. I loved her because she did so much for AIDS and she was a great friend to me. We had a falling out, but we reconciled in the end. It was an extraordinary summer. Gianni Versace was murdered, and then Diana rang me up and we reconciled."

11 / 28 Fotos

Cara Delevingne and Eugenie of York - The model and actress is close with both Prince Harry and Princess Eugenie of York. They were all spotted together at Suki Waterhouse's holiday party in 2016, and Delevingne was also part of the A-lister guests at Princess Eugenie's wedding last October. It is said that the model texted her royal pal to ask if it was okay for her to wear a tuxedo at the wedding. Eugenie responded: "Of course." We're glad she accepted, since she looked exquisite in the ensemble!

12 / 28 Fotos

Ellie Goulding and Prince William - Ellie Goulding and Prince William are also good friends. The singer even had the privilege of performing at his wedding with Kate in 2011.

13 / 28 Fotos

Ellie Goulding and Prince Harry - She has also been good pals with Prince Harry for some time now, and furthermore performed at Harry's 30th birthday party. Although rumors suggested they were an item, it appears that they're just good friends.

14 / 28 Fotos

Usain Bolt and Prince Harry - During that same Caribbean tour, the prince also became close with the Olympic winner after they met and had a race in Jamaica. The former runner told Hello!: "I really enjoy hanging out with him. Every now and then we see each other because we travel around so I see him sometimes." Before Harry's wedding, Bolt publicly offered to throw him a bachelor party in Jamaica. Friendship goals!

15 / 28 Fotos

Priyanka Chopra and Meghan Markle - Chopra and Markle haven't been friends for that long, but have become very close. They met at the annual Elle Women in Television dinner in 2016, and according to Markle it clicked right away: "And you know when you meet someone and you just 'click'... It was just an easy, natural progression."

16 / 28 Fotos

Reese Witherspoon and Kate Middleton - Witherspoon and the Duchess of Cambridge met during a private brunch party in the Hollywood Hills in 2011. The following year, Middleton sent an adorable baby gift to Reese Witherspoon, who just had given birth to a boy.

17 / 28 Fotos

Tom Hanks and Princess Diana - Tom Hanks was a personal friend of Lady Di. They met on several occasions, and he attended her funeral. The two were not only friends, but also 17th cousins through their common ancestor, Sir William FitzHugh.

18 / 28 Fotos

Geri Halliwell and Prince Harry - Ex-Spice Girl Geri Halliwell (now Horner) is very friendly with the British royal family. Ginger Spice met Prince Harry when he was only 10, and has bumped into him a few times after. The old friends also enjoyed the Grand Prix in Abu Dhabi together in 2014.

19 / 28 Fotos

Karlie Kloss and Princess Beatrice of York - When she was living in New York, Princess Beatrice befriended plenty of celebrities. One of them is Victoria's Secret model Karlie Kloss, with whom she appears to be very close. After the model got engaged to Josh Kushner, she announced it to her family and close friends, including Beatrice, who had the best reaction ever. If your friends don't get this happy for you, are they even your friends?

20 / 28 Fotos

Joan Rivers and Prince Charles - Joan Rivers and Prince Charles were introduced by mutual friends and became pals in 2003. The late American personality was also one of the four American celebs who were invited to the Prince's wedding to Camilla in 2005. The royal pair paid tribute to the artist after hearing the news of her death, calling her an "extraordinary woman with an original and a indefatigable spirit."

21 / 28 Fotos

Malin Åkerman and Princess Madeleine of Sweden - The Swedish-born actress and model Malin Åkerman has friendly relations with Swedish Princess Madeleine. The actress often supports the royal at the World Childhood Foundation Gala. Åkerman said that the royal that was quite down to earth: "[Princess Madeleine is] absolutely lovely and is just, I hate to say a regular girl, but she’s a regular girl, who is wonderful and a little bit more poised than most of us. But she's great. A really cool girl."

22 / 28 Fotos

Joss Stone and Prince Harry - The singer has been a good friend of the prince for years now, and often supports him during his humanitarian works. She is also an ambassador of Sentebale, a charity founded by Prince Harry to help vulnerable children in Botswana and Lesotho.

23 / 28 Fotos

Mila Kunis, Ashton Kutcher and Princess Beatrice of York - Princess Beatrice of York and Hollywood couple Mila Kunis and Ashton Kutcher are good friends, and they even went on vacation together to Saint-Tropez. They met through Beatrice's ex-boyfriend, Dave Clark, and stayed very close.

24 / 28 Fotos

Rihanna and Prince Harry - Rihanna and the Prince met during his Caribbean tour on behalf of Queen Elizabeth in 2012. The twosome volunteered at an event on World AIDS Day and underwent a HIV test. Later that day, the Prince attended Rihanna's concert.

25 / 28 Fotos

Chris Martin and Prince Harry - The Coldplay singer and the Duke of Sussex shared a hug at the Sentebale benefit concert at the Kensington Palace in 2016. The Prince joined the band on stage during their performance and warmly thanked his pal.

26 / 28 Fotos

Eddie Redmayne and Prince William - The British actor and the prince became friendly in college, as they both attended Eton College. Despite playing on the same rugby team, they haven't really kept in touch after school.

27 / 28 Fotos

0 / 28 Fotos

Prince Harry and James Blunt - Prince Harry served alongside the British singer in the same army regiment and they have remained friends ever since.

1 / 28 Fotos