Patrick J. Adams, left, and Gabriel Macht in a scene from the series, "Suits." Co-starring with Markle in the series may have scored them invites to the Royal Wedding. (Shane Mahood/USA Network via AP)
There will be around 600 guests at the wedding of Prince Harry and Meghan Markle including a number of famous faces who are expected to attend.
THE QUEEN AND PRINCE PHILIP
As the head of the royal family, Queen Elizabeth is expected to attend the wedding of her "most dearly beloved grandson" - but there is some doubt whether her husband, and Harry's grandfather, Prince Philip will be by her side.
The Duke of Edinburgh underwent hip replacement surgery in April and may not yet be enough recovered to attend the May 19 nuptials. However, a spokesperson for Kensington Palace says the royal family "very much hope" he will be there.
PRINCE CHARLES AND THE DUCHESS OF CORNWALL
Harry's father will not only be front and centre at the wedding of his second son, but will also host an intimate reception for 200 of the couple's closet family and friends at Frogmore House later that night.
By his side will be his wife, and Harry's stepmother Camilla The Duchess of Cornwall.
After days of speculation, Kensington Palace has confirmed that Markle's father Thomas Markle won't be able to attend after undergoing heart surgery.
He was expected to walk his daughter down the aisle.
Her mother Doria Ragland is in England and will accompany her on the car ride to the chapel after they spend the night together at Cliveden House in WiNdsor.
THE DUKE AND DUCHESS OF CAMBRIDGE
As the older brother of the groom Prince William will serve as Harry's best man on the day and will be by his sibling's side as he makes his way to the church.
Catherine, The Duchess of Cambridge, is also expected to attend as are the pair's two eldest children, Prince George and Princess Charlotte, will be in their uncle's wedding party.
Kensington Palace has confirmed the couple's youngest child, newborn Prince Louis, will not be attending.
Markle has a dedicated girl squad who often featured on her now-defunct blog The Tig and who are expected to have received invites to her wedding.
Among them is Indian actress Priyanka Chopra who has confirmed she will be at the ceremony. "It's not just going to be life-changing for both of them, it's life-changing for the world that needs to see strong women as icons, and I think Meghan has the potential to be that," Chopra previously told PEOPLE Now.
Also expected to be invited is Made in Chelsea star and heiress Millie Mackintosh who became close to the former US actress after they met in 2016.
Stylist Jessica Mulroney is also close to the bride-to-be and will be one to spot at St George's, as will long-term confidant and university pal Lindsay Roth - who had Markle as her maid of honour at her 2016 wedding.
Finally, the woman rumoured to be behind Harry and Markle's now infamous blind date, fashion designer Misha Nonoo, is also a safe bet to see at the wedding.
While there's been no word yet on which of the groom's friends have been invited to his long-awaited wedding rumours are circulating as to who might show up.
Eton pal Thomas Inskip is expected to be there, his own recent wedding in Jamaica was one of the first times Harry and Markle were spotted together.
Also expected is Jake Warren, one of Princess Diana's godsons and a childhood friend of Harry's and Thomas van Straubenzee, who is one of Princess Charlotte's godfathers.
Prince Seeiso of Lesotho has confirmed he and his wife Princess Mabereng will be at the wedding, the prince co-founded the Sentebale charity with Harry in 2006.
There's no word yet on whether some of Harry's army pals made the guest list - but royal watchers have tipped some will have been invited.
Kensington Palace has confirmed that not only will all three siblings of the late Diana, Princess of Wales--Lady Sarah McCorquodale, Lady Jane Fellowes, and Earl Charles Spencer--attend the wedding, but Lady Jane will also give a reading during the ceremony.
THE CAST OF SUITS
After shooting seven seasons of US Legal drama Suits Markle has reportedly formed some close bonds with her castmates, many of whom are tipped to have nabbed invitations to the wedding of the year.
Markle has previously gushed about actress Sarah Rafferty, who is expected to make her way to Windsor, in posts to her now-deleted Instagram account - while on-screen love-interest Patrick J Adams could have also scored an invite.
Tennis superstar Serena Williams is believed to have been invited to the royal wedding after she and Markle struck up a firm friendship.
Having known Harry since he was a young boy, the Spice Girls were rumoured to present on the day, after Mel B hinted they would be at St George's Chapel - however, Mel C says the news came as a surprise to her and she hadn't received an invite.
© AAP 2018