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Programming note: No royal wedding invitation? Not to worry. You can stream every moment on your mobile phone, laptop, or wherever you get CNN, starting at 5 a.m. ET on Saturday, May 19.

(CNN) —  

An invitation to the wedding of Prince Harry and Meghan Markle has to be one of the most coveted of the year. But so far, little has been revealed about who their 600 guests in Windsor will be.

The May 19 wedding is a private, not state occasion, paid for by the royal family. This means political leaders don’t have to be invited, so Harry and Meghan can pack St. George’s Chapel with close friends and family.

Many of the faces will be familiar – including the UK royals, celebrities and actors. But others will be less well known, including Markle’s family and people who’ve become friends with the couple through their charitable work.

Here’s CNN’s best guess at who might be on the guest list.

Prince Harry’s likely guests

Queen Elizabeth II and Prince Philip attend the 2017 Braemar Highland Gathering in Braemar, Scotland.
Mark Cuthbert/UK Press/Getty Images
Queen Elizabeth II and Prince Philip attend the 2017 Braemar Highland Gathering in Braemar, Scotland.

The royal family will be among the most closely watched guests on the day. Harry’s grandmother, Queen Elizabeth II, will be accompanied by Prince Philip, who has recently undergone a hip operation.

Also there will be Prince Charles and Camilla, Duchess of Cornwall. The occasion may bring back some memories – a wedding blessing was held for them at St. George’s Chapel following their civil marriage ceremony in 2005.

Princess Charlotte and Prince George with their parents in Warsaw, Poland, on 19 July 2017.
Mateusz Wlodarczyk/NurPhoto via Getty Images
Princess Charlotte and Prince George with their parents in Warsaw, Poland, on 19 July 2017.

Prince William will act as best man, a role Harry fulfilled for his brother at his wedding in 2011. William and Catherine, Duchess of Cambridge, welcomed a new addition to the family on April 23 – but little Prince Louis won’t be present at the wedding.

The couple’s older children, Prince George, 4, and Princess Charlotte, 3, will play a part as page boy and bridesmaid, as they did last year for their aunt, Pippa Middleton.

Prince Harry’s goddaughters Florence van Cutsem, 3, and Zalie Warren, 2, are also among the six young bridesmaids named by Kensington Palace. His godson Jasper Dyer, 6, is another of the four page boys.

Harry’s uncle, Prince Andrew, is sure to be there, but a question mark hangs over his ex-wife Sarah Ferguson, known as Fergie, who was not invited to Prince William’s wedding. Their daughters Princess Beatrice and Princess Eugenie – who will herself marry fiancé Jack Brooksbank in St. George’s Chapel on October 12 – are expected to attend.

Charles, Earl Spencer, and Lady Sarah McCorquodale are greeted by Harry after the 10th anniversary memorial service for Diana in 2007.
Tim Graham/Tim Graham Photo LibraryGetty Images
Charles, Earl Spencer, and Lady Sarah McCorquodale are greeted by Harry after the 10th anniversary memorial service for Diana in 2007.

Relatives from his late mother Diana’s side of the family will also be present. They include his uncle, Earl Charles Spencer, and Diana’s two sisters, Lady Sarah McCorquodale and Lady Jane Fellowes, the latter of whom will give the reading at the service.

Harry is not expected to invite European royals as William did in 2011, when he and Kate packed Westminster Abbey with some 1,900 guests.

Prince Harry talks with Prince Seeiso of Lesotho at a fundraising polo match for their Sentebale charity in 2006 in Surrey, England.
Tim Graham/Tim Graham Photo Library/Getty Images
Prince Harry talks with Prince Seeiso of Lesotho at a fundraising polo match for their Sentebale charity in 2006 in Surrey, England.

But one member of royalty who will almost certainly be there is Lesotho’s Prince Seeiso. He and Harry founded the Sentebale charity together more than a decade ago to help some of the most vulnerable children in Lesotho and Botswana.

Other friends of Harry’s will also make up a chunk of the guest list.

Godfather James Meade arrives for the christening of Princess Charlotte in July 2015.
Mary Turner/The Times/PA Wire/AP
Godfather James Meade arrives for the christening of Princess Charlotte in July 2015.

Among his and Prince William’s closest companions are James Meade, Thomas van Straubenzee, Tom Inskip and Guy Pelly, a nightclub owner. Over the years they have been pictured carousing together in party spots in London and around the world.

Prince Harry chats with singer James Blunt as he rehearses for the Invictus Games closing ceremony in London in 2014.
Chris Jackson/Getty Images
Prince Harry chats with singer James Blunt as he rehearses for the Invictus Games closing ceremony in London in 2014.

Harry may also invite comrades from his days in the military, including at the Royal Military Academy Sandhurst and in Afghanistan. One of those is singer James Blunt, with whom Harry served in the British Army.

Soul singer Joss Stone performs in the Dutch city of Rotterdam last November.
Paul Bergen/Redferns/Getty Images
Soul singer Joss Stone performs in the Dutch city of Rotterdam last November.

British soul singer Joss Stone is a longtime friend and likely invitee. She is an ambassador for Harry’s Sentebale charity and has taken part in benefit performances for it in the past, including a 2016 concert at Kensington Palace.

Adding to the celebrity count, Harry could invite British model and actress Cara Delevingne, who has reportedly been a good friend for years.

Nacho Figueras, seen at a polo match in New Jersey in 2017, is an ambassador for Sentebale.
Andrew Toth/Getty Images
Nacho Figueras, seen at a polo match in New Jersey in 2017, is an ambassador for Sentebale.

Another Sentebale ambassador who may well have received an invitation is Argentine polo player Ignacio “Nacho” Figueras. Figueras, who is also an author and the global face of Polo Ralph Lauren, has played in several Sentebale charity matches with Prince Harry around the world.

Chelsy Davy and Prince Harry attend his Army Air Corps pilots' course graduation ceremony in May 2010 in Andover, England.
Max Mumby/Indigo/Getty Images
Chelsy Davy and Prince Harry attend his Army Air Corps pilots' course graduation ceremony in May 2010 in Andover, England.

Prince Harry may invite two of his exes: Chelsy Davy, his on-off girlfriend of several years from 2004, and aristocratic actress and model Cressida Bonas, his girlfriend from 2012 to 2014.

Singer Ellie Goulding – whom Harry was also at one time rumored to be dating – has been named in the media as another possible invitee. Goulding performed at William and Kate’s evening reception at Buckingham Palace, including the song for their first dance, she told Vanity Fair.

Ellie Goulding poses for photographers at the Brit Awards in London in February.
Vianney Le Caer/InvisionInvision/AP
Ellie Goulding poses for photographers at the Brit Awards in London in February.

It’s possible that singer Sir Elton John will also make an appearance. He was a friend of Diana and famously performed a rewritten version of his song “Candle in the Wind” at her funeral in 1997. He was invited to William and Kate’s wedding 14 years later.

Celebrity couple David and Victoria Beckham were also at William and Kate’s wedding and could score an invitation to Harry and Meghan’s big day too. Asked by James Corden on “The Late Late Show” if she was going, Victoria stumbled over an answer before saying, “I don’t know.”

Meghan Markle’s likely guests

Meghan Markle and Doria Ragland are seen at a UN women's event in New York City in 2015.
Sylvain Gaboury/Patrick McMullan/Patrick McMullan/Getty Images
Meghan Markle and Doria Ragland are seen at a UN women's event in New York City in 2015.

Markle’s family is less accustomed to the spotlight than her fiancé’s. Both her mother, Doria Ragland, to whom Meghan has said she is very close, and her father, Thomas Markle, Sr., were expected to play a role in the wedding.

However, Meghan confirmed two days before the ceremony that her father would not be attending. His last-minute withdrawal followed a controversy involving staged photos captured by an American paparazzo and concerns over his health.

On the morning of May 19, a car will take Meghan and her mother together to Windsor Castle. They will spend the night before the wedding at a luxury hotel in Berkshire.

Her parents split when Meghan was young, but she told Vanity Fair last year that they remained on good terms as she grew up and even took vacations together as a family. Markle and Ragland had met in the late 1970s at a Hollywood studio where he was working as a lighting director and she was a temp.

Meghan included her mother in a list of 10 women who had changed her life for Glamour magazine last year, when she described Ragland as both a free spirit and a nurturer. “We can just have so much fun together, and yet, I’ll still find so much solace in her support. That duality coexists the same way it would in a best friend,” she wrote.

The bride-to-be has a number of close friends who are very likely to have received one of the precious gilded invitations. However, Meghan has opted not to have a maid of honor, according to Kensington Palace. “She has a very close-knit group of friends and did not want to choose one over the other,” said Jason Knauf, Prince Harry’s communications secretary.

Meghan Markle and Jessica Mulroney attend the Instagram Dinner in Toronto, Canada, in 2016.
George Pimentel/WireImage/Getty Images
Meghan Markle and Jessica Mulroney attend the Instagram Dinner in Toronto, Canada, in 2016.

It seems certain that Canadian stylist Jessica Mulroney, a longtime friend who, according to Vanity Fair, has helped her to plan the big event, will be present with husband Benedict. Their 4-year-old daughter Ivy is among the bridesmaids and their two sons, Brian and John, both 7, are page boys.

Markle’s two goddaughters, Remi and Rylan Litt, ages 6 and 7 respectively, have also been named by the palace as bridesmaids. Their mother, US businesswoman Benita Litt, is reportedly one of Markle’s closest friends.

Markle’s friend from her days studying at Northwestern University, Lindsay Roth, is another likely invitee, especially since Markle was her maid of honor, according to People magazine. Roth told the magazine last year: “We’re the kind of friends who can be 3,000 miles away and still be talking about or thinking the same thing, and even texting each other the same thing at the same time miles away.”

Priyanka Chopra is pictured on TV show "Sunday Today with Willie Geist" in February.
Mike Smith/NBC/NBCU Photo Bank/Getty Images
Priyanka Chopra is pictured on TV show "Sunday Today with Willie Geist" in February.

Indian actress and UNICEF Goodwill Ambassador Priyanka Chopra hasn’t known Markle for as long, but Instagram posts show the pair having fun together. Us Weekly magazine says Chopra has confirmed she will attend the wedding.

Markle and Misha Nonoo attend the 12th annual CFDA/Vogue Fashion Fund Awards  in New York City in 2015.
Andrew Toth/Getty Images
Markle and Misha Nonoo attend the 12th annual CFDA/Vogue Fashion Fund Awards in New York City in 2015.

Another friend, Bahrain-born, London-raised fashion designer Misha Nonoo, is rumored by UK and US media to have been the matchmaker who brought Harry and Meghan together on their first date. She and Markle have reportedly holidayed together in the past and Meghan wore a shirt from her collection on her first public appearance with Harry at the Invictus Games last year.

Meghan Markle and Markus Anderson attend an event in  2014 in Toronto, Canada.
George Pimentel/WireImage/getty images
Meghan Markle and Markus Anderson attend an event in 2014 in Toronto, Canada.

Other media rumors point to Markus Anderson, a consultant for the Soho House Group, which has private members’ clubs around the world, as having made the all-important introduction between his good friend Meghan and Harry.

Tennis superstar Serena Williams has been firm friends with Meghan for several years. “Her personality just shines,” Williams told Vanity Fair for a cover story on Markle last year, adding that the actress had asked her for advice on dealing with aspects of life in the spotlight.