Members of the Nxivm 'sex cult' led by Smallville actress Allison Mack reportedly held wild parties on billionaire Richard Branson's private Caribbean island at least twice.

According to The Sun, several members, including co-founder Nancy Salzman, visited Branson's Necker Island for two seminars in 2007 and 2010.

Former Nxivm publicist Frank Parlato told the newspaper: 'I was told the reason they staged the seminars on Necker was they hoped to recruit Branson into the organization.'

Parlato said that the businessman 'would have been the biggest score they ever had'.

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Nxivm 'sex cult' members reportedly held wild parties on billionaire Richard Branson's private Caribbean island at least twice. The Sun obtained photos that showed Branson and Sara Bronfman (pictured) together. The photos were reportedly taken on Necker Island in 2010

According to The Sun, several members, including co-founder Nancy Salzman (right) and Allison Mack (left) visited Branson's Necker Island for two seminars in 2007 and 2010

One of the visits was reportedly paid for by billionaire heiress and Nxivm follower Sara Bronfman, whose late father, businessman Edgar Bronfman Sr, knew Branson, according to the Sun.

Sara's sister, Clare, is also one of Nxivm's longtime followers. Clare recently took over as leader for the 'sex cult' after actress Allison Mack and leader, Keith Raniere were arraigned on sex trafficking charges.

According to the Sun, Raniere did not visit the island during the alleged visits. Raniere was arrested on the sex trafficking charges in Mexico in March.

The Sun obtained photos that showed Branson, Sara and Mack together. The photos were reportedly taken on Necker Island in 2010.

Parlato claims that Salzman 'said she did the teaching by day. But she said he [Branson] became increasingly restless and hosted really crazy parties that started earlier and earlier'.

Branson told the newspaper that he was not aware of any seminars. He claims he has never heard of Raniere and never met him.

One of the visits was reportedly paid for by billionaire heiress and Nxivm follower Sara Bronfman, whose late father, businessman Edgar Bronfman Sr, knew Branson. Sara is pictured, (right) with her sister, Clare (left), who is currently running Nxivm

Former Nxivm publicist Frank Parlato claimed: 'I was told the reason they staged the seminars on Necker (pictured) was they hoped to recruit Branson into the organization.' Parlato said that the businessman 'would have been the biggest score they ever had'

Nxivm founder Keith Raniere (pictured) reportedly did not visit the island during the alleged visits. Raniere was arrested on the sex trafficking charges in Mexico in March

A Virgin Management spokesman said that 'there is absolutely no association between Sir Richard and the Nxivm group or its leader'.

It seems unlikely that Raniere will be able to strike any deals with the US attorney's office, who successfully petitioned to have him held without bail in a letter to the court stating that the cult leader had sexual relationships with two minor females, aged 15 and 12, in the past.

The allegations against Raniere and Mack were outlined in a Complaint and Affidavit in Support of Arrest Warrant that was filed back on February 14.

Special Agent Michael Lever with the FBI had been investigating Raniere and speaking with former cult members, including two women known as Jane Doe 1 and Jane Doe 2.

Lever states that Raniere came up with the idea for Nxivm's sex slave program, known as DOS, during the summer of 2015.

A woman by the name of CC-1, who was revealed to be Mack in subsequent filings, was his first 'slave,' and provided 'collateral' which guaranteed she would remain faithful to him by providing Raniere with damning material.

Mack was reportedly Raniere's number two for years and implemented a strict diet for the 'sex slaves'

'CC-1's email was titled "vow 3" and included an attached letter. The letter pledged CC-1's "full and complete life" to 14 RANIERE,' reads the complaint.

'In the letter, CC-1 used the terms "slave" and "master" to refer to herself and RANIERE. Moreover, the letter identified "collateral" to "cement" the vow made by CC-1.

'This collateral was described as: (1) a letter regarding CC-1's mother and father that would "destroy their character"; (2) a contract that transferred custody of any children birthed by CC-1 to RANIERE if CC-1 broke her commitment to RANIERE; (3) a contract that transferred ownership of CC-1's home if the commitment to RANIERE was broken; and (4) a letter addressed to social services alleging abuse to CC-1's nephews.'

It is not clear if any of the claims made in those letters were true.

Soon, CC-1 was recruiting slaves of her own and filling out the pyramid that Raniere had hoped to create, selecting Jane Doe 1 as one of these women.

Allegations of Raniere's alarming and illegal sexual predilections are also outlined in a letter sent by US Attorney Richard P Donoghue to Judge Steven M Gold back in March.

The allegations against Raniere and Mack were outlined in the Complaint and Affidavit in Support of Arrest Warrant that was filed back on February 14

'According to confidential sources, the defendant had repeated sexual encounters with multiple teenage girls in the mid-to-late 1980s and early 1990s,' reads the letter.

'In one instance, the defendant met a fifteen-year-old girl while he was in his 20s and had repeated sexual contact with her. In another instance, the defendant met a twelve-year-old girl whose mother worked for the defendant and began tutoring her.'

The letter goes on to say: 'Shortly thereafter, the defendant began having regular sexual intercourse with her, including at his home where he lived with multiple adult sexual partners.'

Raniere is also said to have voiced his belief that the age of consent should be lowered to when a parent believes their child is capable to sexual activity.

Mack was arrested and arraigned on federal charges of sex trafficking and conspiracy to commit forced labor.

Those are the same charges thatRaniere, 53, is being charged with, and both are facing a possible sentence of life behind bars.

The group has a large base in Albany, but a number of its most high-profile members decamped to Mexico earlier this year.