Sarah Ferguson allegedly had a “friends with benefits” arrangement with Sean “Diddy” Combs, and once took daughter Princess Eugenie to one of the rapper’s infamous parties.

That’s one of many wild claims made by sources in “Entitled” by author Andrew Lownie — one of which alleged in an excerpt published by the Daily Mail on Friday that the former Duchess of York “made no secret how she wanted to marry someone in the US who was wealthy and powerful.”

Speaking of Jeffrey Epstein — with whom Ferguson and ex-husband Andrew Mountbatten-Windsor allegedly had friendships — a Palm Beach, Florida, source said, “If Jeffrey popped the question, she would have said yes. Even after… he was convicted of being a sex offender. She had a reputation for being an opportunist and for sleeping with wealthy men.”

The book also claimed that one of the powerful men Ferguson slept with was Combs — a claim allegedly confirmed by another “associate” of the rap mogul.

He first met Ferguson back in 2002 in New York at a party hosted by Ghislaine Maxwell, the source alleged.

The insider claimed the “secret friends with benefits” arrangement lasted four years, beginning in 2004.

Combs launched the perfume Unforgivable in 2006, which he said was inspired by Ferguson and how she liked men to smell.

The pair were said to have met up in Africa and Europe, where they’d “meet in luxurious hotels” and “once stayed at a seven-star hotel that was over £50,000 a night. They spared no expense.”

The excerpt also alleged that Ferguson, now 66, introduced daughters Princess Eugenie, 36, and Princess Beatrice, 37, to the Sean John designer “many times” when they were younger.

On one occasion, the excerpt alleged Eugenie — who was 16 at the time — accompanied her mother to a yacht party weekend.

“Sean’s parties were wild,” a Royal Family staff member said, per the excerpt. “The fact that she brought Eugenie around was alarming.”

The report comes three months after the Department of Justice (DOJ) released millions of files in connection to criminal investigations into the late child sex offender — one of which revealed that Ferguson made a crude comment about Eugenie in an email to Epstein.

In one correspondence, Epstein contacted Ferguson in March 2010. “ny [New York]?” the late Epstein wrote at the time, to which she emailed back, “Not sure yet. Just waiting for Eugenie to come back from a shagging weekend!!”

Ferguson shares her daughters with the former Prince Andrew, 66 — who was stripped of his “prince” title in October 2025 and eventually forced to move from his longtime home at Royal Lodge in February.

Andrew was previously accused of sexual abuse by Virginia Giuffre, who died by suicide last April.

He was arrested in February on suspicion of misconduct in public office for allegedly forwarding confidential trade documents to Epstein. He’s consistently denied all accusations against him.

Ferguson, too, lost her royal titles and her place at Royal Lodge amid the scandal.

In September 2025, children’s hospice charity Julia’s House cut ties with Ferguson after an emailed apology to the child rapist — in which she called the convicted sex offender a “steadfast, generous and supreme friend” — was leaked.

Combs is currently serving a 4-year sentence in a federal prison in New Jersey following an October 2025 conviction on charges of transporting individuals for prostitution.

He’s expected to be released in April 2028.

Reps for Diddy, Princess Eugenie, and Ferguson did not immediately respond to Page Six’s requests for comment on Friday.