Joan Collins has confirmed that award-winning actress Isabella Rossellini has joined the cast of The Bitter End – a biopic about American socialite Wallis Simpson.

The Hollywood icon, 91, took to Instagram on Thursday to share the exciting news, revealing that the 72-year-old Conclave star will appear in the upcoming film.

Looking as glamorous as always, Joan told the camera: ‘I am so thrilled to announce that the wonderful actress Isabella Rossellini has agreed to be in our new movie, The Bitter End.

‘This is such a wonderful idea, and I think that she is going to just have a marvelous time, and I can’t wait to meet her and enjoy this story of two women at odds with each other, which is a really great script. 

‘And we are going to start soon, and I shall be announcing some other starry, starry announcements of other people that are going to be in it sooner rather than later.’

In the film, Joan will play Wallis, while Isabella will portray Suzanne Blum, who has been described in a press release as ‘the formidable French lawyer and confidante of Wallis Simpson.’

Joan Collins has confirmed that award-winning actress Isabella Rossellini has joined the cast of The Bitter End – a biopic about American socialite Wallis Simpson 

The Hollywood icon, 91, took to Instagram on Thursday to share the exciting news, revealing that the 72-year-old Conclave star will appear in the upcoming film (Isabella pictured at the AcademyAwards Nominees Dinner last week)

The Bitter End will be the debut project of new film studio founded by award winning entertainment producer John Gore, a 22-time Tony winner, as well as a recipient of two Emmys and two Oliviers.

In May, Joan will be celebrating her 92nd birthday, but she won’t have time to party, as she begins filming the new feature film.

The actress said: ‘I am thrilled about the challenge of playing this iconic woman in a previously untold story and to be in John Gore Studios’ initial roster of what I’m sure will be a very successful endeavour.’

The five-time married British actress has graced screens for more than seven decades and is considered one of the last surviving actors from Hollywood’s golden age.

Meanwhile as an American divorcee who seduced a British royal, Wallis Simpson has been dubbed the original Meghan Markle.

Simpson was at the centre of the most scandalous love affair of the 20th century when she entered into a relationship and marriage with Prince Edward VIII, Prince of Wales and heir to the throne.

His obsession with Wallis subjected her to a brutal character ᴀssᴀssination. She was called a temptress and sorceress who had cast a spell on the fairy-tale Prince to become Queen.

In 1936, King Charles’s great-uncle Edward VIII’s chose to abdicate the throne to marry her.

As an American divorcee who seduced a British royal, Wallis has been dubbed the original Meghan Markle

In 1936, King Charles’s great-uncle Edward VIII’s choice to abdicate the throne to marry her

Wallis seen in 1936 posing with her Cartier emerald engagement ring and a diamond and sapphire bracelet that was a gift from Edward

Edward VIII giving his abdication broadcast to the nation and the Empire, December 11, 1936

The abdication notice signed by Edward VIII at his Fort Belvedere home. His brothers Albert, Henry and George also signed the document

The move clashed with his responsibilities as head of the Church of England – sparking a consтιтutional crisis which left the nation stunned and began a rift within the family that never healed.

Read More Dame Joan Collins, 91, takes on the role of Wallis Simpson in a new biopic

The couple went into exile in France at Villa Windsor, a 14-room Parisian townhouse, where they received guests including British fascist leader Sir Oswald Mosley and his wife Diana.

The Duke had hoped his exile would be brief but he was never allowed to move back to Britain, with his brother the new King George VI threatening to cut off his allowance if he tried to return without an invitation.

Edward’s health deteriorated in the 1960s and towards the end of 1971, the Duke – a heavy smoker – was diagnosed with throat cancer.

Netflix’s The Crown depicted how, in May 1972 – ten days before his death – Edward was visited by Queen Elizabeth II and Prince Philip.

She spoke to him alone before appearing with just the Duchess for a pH๏τograph. Edward died on May 28, less than a month before his 78th birthday.

It was only after death that the tension in the family seemed to dissipate and Edward’s body was returned to Britain, where it lay in state at Windsor Castle’s St George’s Chapel before his funeral.

Wallis died in 1986 aged 89 after years of frailty and suffering from dementia which led to her living as a recluse.

The Royal Family allowed her to be buried next to her late husband on Windsor’s grounds.