While many of us tune in to King Charles' Coronation on May 6 - there will be a big party going on across the Pond.
The eyes of the world will be on Charles and Queen Camilla as they are crowned inside Westminster Abbey, but many of the guests might be wishing they were at another special event.
Meghan Markle isn't going to the Coronation, instead choosing to remain at home in California to be with Archie and sister Lilibet, because it's her son's fourth birthday.
It will be a very different story Stateside to the pomp and ceremony of the Coronation as Archie will be centre of attention at his "intimate" birthday party.
And Harry is so desperate to be there that he's flying off straight after the ceremony and missing the rest of the bumper weekend action.
With Archie's birthday being the second hottest ticket in town on May 6, here's a look at the potential guest list.
Doria Ragland
The first name on the party guest list has to be granny Doria.
Doria is reportedly a very hands-on grandma to Archie, three, and Lilibet, one, and was indispensable to the Sussexes when they first became parents.
The grandmother temporarily left her home in California in April 2019 and flew to London to be with her heavily pregnant daughter for a month.
Doria lives in California so isn't too far away from Harry and Meghan, and they reportedly have a guest quarters where she can stay over.
She was present at Archie's very first birthday and will be keen to celebrate with her grandson again.
Serena Williams
Tennis ace Serena Williams is a long-term pal of Meghan and has also grown close to Harry over the years.
Meghan has frequently been spotted in the stands at her pal's big tennis matches - cheering on from the sidelines.
Serena helped organise her baby shower and it was actually the Sussexes who helped convince the Grand Slam champion to retire from the sport.
The tennis star also appeared in the couple's Netflix docuseries, where she spoke about being a guest at their 2018 wedding.
Serena said: "To have her culture represented at that wedding. Amazing, I loved it. I thought it was really courageous breaking boundaries but not trying to."
It's also believed Serena's daughter Olympia is a playmate of Archie and Lili, so they could all get together for a fun celebration on May 6.
Orlando Bloom
Hollywood actor Orlando Bloom has struck up quite the friendship with Prince Harry - and he only lives round the corner.
The pair got friendly after becoming neighbours when the Sussexes moved to Montecito, California in 2020.
In 2020, Orlando said: "This guy is so nice, and I think he's got a great sense of humour. I hope he maintains that through this because they're sort of on a pedestal. We're showing real adoration to them in one form or another.
"I try to justify it, because quite frankly, if I'm honest, it's not like me to poke fun at anyone but it is done with affection."
Harry apparently had a "sense of humour" about Orlando voicing his character in HOB cartoon The Prince, so they're clearly good mates.
However, Orlando would have quite the dilemma on his hands as fiancée Katy Perry is performing at the Coronation concert on May 7.
The Legolas actor would need to decide whether to attend Archie's party, if invited, or watch his partner sing at Windsor Castle.
Or he could do what Harry is doing in reverse, making a quick dash from California to the UK after the birthday bash.
George and Amal Clooney
George and Amal Clooney were invited to the Sussexes' wedding in 2018, but it's claimed they didn't actually know the newlyweds at the time.
However, it seems a friendship began to blossom in the following months as Harry and Meghan spent the weekend at the Clooney's house in Lake Como in August that year.
"The Clooneys had personally invited Meghan and Harry to their home at the beginning of the summer with an open invitation,” a source told US Weekly .
"George and Amal were so happy to host Meghan and Harry. Harry and George have a special bond and friendship."
It's claimed that Amal and Meghan have many similar interests, with the barrister helping the Suits actress settle into London life.
Speaking about his friendship with the Sussexes, Clooney told the MailOnline in 2019 that they had enjoyed dinner parties together.
"We live not too far from one another and we have dinners and stuff and we’re friends with them for all the reasons that you're friends with anybody," the actor explained.
"They’re just really nice, fun, kind people. They're a very loving couple, and they're going to be great parents."
Amal also helped organise Meghan's baby shower in New York in 2019, so they already know how to party together.
Ellen DeGeneres and Portia de Rossi
Chat show host Ellen DeGeneres and actress wife Portia de Rossi have become very close with Meghan and Harry over the years.
Although Ellen awkwardly doesn't actually remember the first time she met the former Suits actress in a pet shelter in LA.
According to Meghan, the Ellen DeGeneres Show host was responsible for pushing her to adopt her dog Bogart, a Labrador-shepherd mix.
Shortly after Archie was born, Ellen and her wife, Portia de Rossi, went over to visit the couple and their newborn in London.
Ellen revealed she had held and fed the youngster and talked to the couple about wildlife conservation.
She also saw the kids at Halloween in 2021, when Archie transformed into a dinosaur and little Lilibet was a skunk.
Ellen has a close relationship with the Sussexes and spent time with their kids, so it would make sense if Ellen and Portia attended Archie's party.
Oprah Winfrey
Famously a friend of the Sussexes, Oprah Winfrey secured that controversial interview in 2021 and was their neighbour in California.
The ctalk show legend was in attendance at their wedding in 2018 and she has repeatedly come to their defence over the years.
In their Netflix docuseries, Harry and Meghan revealed that Oprah was one of the only people to visit them at Frogmore Cottage.
Harry said Oprah came over for tea and was stunned by where they were living, telling them: "No one would ever believe it."
Last month, presenter Gayle King, who is also a good friend of Harry and Meghan, asked the chat show legend whether they should attend the Coronation.
Gayle asked: "Do you think they should go, do you think they should not go? Is it something you'd like to comment on? I'm listening."
Speaking on CBS Morning, Oprah replied: "I think they should do what they feel is best for them and for their family. That's what I think.
"That's what the bottom line comes down to. What do you feel like is the right thing for you?"
Oprah added: "They haven't asked me my opinion. No they have not."
With Meghan staying at home, her good pal Oprah could be popping round for a celebration.
Jessica Mulroney
Jessica Mulroney was once Meghan Markle's closest friend and would ordinarily have always been at any party she was hosting.
The former Suits actress became pals with the Canadian fashion stylist while they were shooting in Toronto - to the point where they were practically inseparable.
All three of Jessica's children had important roles at Meghan's wedding to Prince Harry and she accompanied her bestie on a royal tour in an unofficial capacity.
However, the cracks in their friendship started to show when Jessica was embroiled in a race row - and dragged Meghan into the controversy.
Jessica was fired from TV gigs, lost her reality show and seemingly her friendship with Meghan - but she recently broke her silence.
If Jessica and Meghan have healed their wounds, then maybe she could be joining in Archie's fun.
