Princess Eugenie, 28, is getting married this Friday, tying the knot with her partner of eight years, Jack Brooksbank.
Most senior members of the Royal Family are attending, including Prince Harry and Meghan Markle.
Some will have obvious roles in the wedding party, with Beatrice predicted to be maid of honour.
But will the other royals also have a role, and if so, what will Meghan Markle’s role be?
Meghan has been the Duchess of Sussex for six months, becoming cousin-in-law with Eugenie back in May.
The two women appear to get along well, often spotted chatting together at public events.
However, despite being seemingly close, it isn’t likely that Meghan will have a role in the wedding, other than a guest.
Princess Eugenie is predicted to have her sister, Princess Beatrice, as her Maid of Honour.
She is also said to have a host of young flower girls in her wedding party, including Robbie Williams’ daughter Theodora Rose, 6, and Princess Charlotte, 3.
However, it has been reported that the Duchess of Sussex has had a role in helping Eugenie plan the big day.
According to The Mail Online, Eugenie and Jack visited Meghan and Harry to get advice on planning their wedding.
A source told the publication: “Princess Eugenie and her fiancé Jack Brooksbank made a trip to see the couple around a month ago for Meghan to help the bride-to-be with her wedding plans.”
The royal foursome met in the cottage that the Sussexes are renting in the Cotswolds, where they spent a lot of their summer.
Meghan and Harry also tied the knot in St George’s Chapel, Windsor Castle, the same location as Eugenie and Jack.
With that in mind, they are more than likely to have shared details on the venue and how to make sure the day runs smoothly.
It is also believed that Meghan will be bound by royal protocol on the big day, having to follow a strict set of rules.
Yesterday, royal expert Camilla Tominey appeared on ITV’s This Morning to discuss the rules Meghan and Kate Middleton will be expected to adhere to.
The journalist revealed it is traditional for Kate Middleton and Meghan to wear outfits they have already worn.
She revealed: “This is so they do not upstage the bride.”
Who is Meghan Markle? Quick profile
Meghan Markle was born Rachel Meghan Markle, on August 4, 1981 to parents Doria Ragland and father Thomas Markle.
Her father was previously married to Roslyn Loveless and Meghan has two elder half sibling – sister Samantha Markle and brother Thomas Markle Junior.
Meghan’s first television appearance in the USA was in an episode of the medical drama General Hospital in 2002.
She later moved on to roles in CSI, Without a Trace and Castle along with bit parts in Hollywood films including Get Him to the Greek, Remember Me and Horrible Bosses.
Meghan was also a “briefcase girl” on Deal or No Deal – but her most famous role was as Rachel Zane in legal drama Suits, which launched in 2011.
She was written out in the finale of the seventh series when her character got married, which aired in April 2018 – just before she got married herself.
Charity and humanitarian work
Meghan Markle’s career in television has gone hand-in-hand with her support for causes close to her heart.
She wrote about the stigma around menstrual health in an article for Time magazine and was a Global Ambassador for World Vision Canada – with whom she travelled to Rwanda for the charity’s Clean Water Campaign.
And her commitment to gender equality has seen her work with the United Nations – receiving a standing ovation in 2015 for her speech to mark International Women’s Day.
In September 2011, she wed film producer Trevor Engelson, who she began dating in 2004.
But the pair divorced two years later in August 2013, citing irreconcilable difference.
She was in a relationship with celebrity chef Cory Vitiello for almost two years, before they broke it off in 2016 but the two remain good friends.
And in June 2016, she met Prince Harry on a blind date set up by a mutual friend.
Their relationship began in October that year and just over one year later, on November 27, 2017, the pair announced their engagement.
They married on May 19, 2018 at St George’s Chapel in Windsor Castle.
Some have claimed Meghan Markle is the first mixed-race member of the Royal Family.
Historians are still arguing about Queen Charlotte, the wife of King George III.
But Meghan will be the first royal to openly embrace a mixed-race heritage.
She has written about the difficulties of being a biracial actress in Hollywood as she claims she is not black enough for some roles and not white enough for others.