SEX beast Jeffrey Epstein and rape accused movie mogul Harvey Weinstein were guests at ­Princess Beatrice’s 18th birthday ball.

Billionaire Epstein, 66, a former pal of Prince Andrew, the birthday girl’s dad, flew into the UK the day before the lavish Victorian-themed bash at Windsor Castle.

10 The Duke and Duchess of York with Princess Eugenie at Princess Beatrice's 18th birthday ball in 2006 Credit: Mark Stewart

10 Jeffrey Epstein attended Beatrice's 18th with British socialite and ex-lover Ghislaine Maxwell Credit: Getty - Contributor

The disgraced tycoon was accompanied to the £400,000 celebration by British ex-lover Ghislaine Maxwell.

Epstein was arrested on child prostitution charges just days later.

Weinstein, 67, went with Georgina Chapman, the Brit designer pal of Beatrice’s mum Sarah Ferguson who created the party girl’s £10,000 blue taffeta gown.

They wed but she divorced him after dozens of women accused him of sexual abuse in the #MeToo scandal. He faces trial next year.

The mask ball’s theme was 1888 to mark 100 years before Beatrice’s birth and guests wore Victorian costume.

It was held on July 15, 2006 and continued the Queen’s tradition of giving her grandchildren a coming of age birthday party. She and Prince Philip did not attend.

PARTY BOMBSHELL

Beatrice’s sister Eugenie, then 16, Peter and Zara Phillips and Prince Edward and Sophie Wessex were at the celebration.

Others among the 400 guests at the do were Demi Moore, her then husband Ashton Kutcher, Pixie Geldof, Kelly Osbourne and Sir David Frost.

The ball’s budget included £215,000 on food and drink — including 400 bottles of champagne — £65,000 on flowers and £120,000 on outfits and staff.

10 Rape accused movie mogul Harvey Weinstein was also among the guests at the royal bash Credit: Getty - Contributor

10 Weinstein went with Georgina Chapman, a pal of Fergie's who designed Princess Beatrice's blue and gold taffeta gown Credit: Getty - Contributor

Epstein’s presence, sources say, sheds new light on how close 59-year-old Prince Andrew was to him.

One said: “It goes to show how Epstein worked his way into the very heart of the British establishment — rubbing shoulders with royalty at a palace.” Eight days after the party, Epstein was held on suspicion of soliciting young girls for prostitution at his Florida mansion.

He served 13 months after cutting a deal.

He killed himself in his cell last month after being arrested on suspicion of abusing girls as young as 14.

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Authorities have vowed to go after his alleged co-conspirators who are believed to include socialite Maxwell, 57, the daughter of disgraced tycoon Robert Maxwell. She has been accused of procuring young girls for him.

Prince Andrew was accused of sleeping with one of Epstein’s alleged sex slaves. He strenuously denied it — and has expressed regret about his friendship with Epstein, which lasted from 1999 to 2010. He has faced increased scrutiny over his links to the scandal.

His spokesman on Saturday declined to comment on “guests at a private event”.

10 Beatrice wearing a blue and gold taffeta gown for her Victorian-themed 18th birthday bash by Georgina Chapman's brand Marchesa Credit: PA:Press Association

10 Eight days after the party, Epstein was held on suspicion of soliciting young girls for prostitution at his Florida mansion Credit: AP:Associated Press

10 Prince Andrew spotted strolling through New York's Central Park with Jeffrey Epstein in 2010 - two years after the sex beast plead guilty to charges of procuring for prostitution a girl under 18 Credit: Jae Donnelly

10 The Duke of York with his arm around Epstein's sex slave Virginia Roberts - at Ghilaine Maxwell's London townhouse as she looks on Credit: Collect

10 Jeffrey Epstein and ex-lover Ghislaine Maxwell on a pheasant shoot with Prince Andrew at the Queen's Sandringham estate in December 2000 Credit: Rex Features

10 The Queen and Prince Philip did not attend granddaughter Beatrice's coming-of-age party Credit: News Group Newspapers Ltd

These are the six questions Prince Andrew MUST answer about the Epstein sex scandal