Two more women have accused Jeremy Piven of sexual assault and harassment, bringing the total number of women to have aired allegations against him to four.

Washington-based advertising executive Tiffany Bacon Scourby, 39, and Hawaii-based porn star Isis Taylor both say Piven, 52, attacked or harassed them.

Scourby, now a married mother-of-two, claims the pair met in 2003 while she was on a business trip in New York City.

At the time, Piven had appeared in a number of films including Black Hawk Down and Runaway Jury.

Scourby says that the pair met at a nightclub where he invited her to accompany him to film an interview on Late Night with Conan O’Brien the following day.

She went to his hotel the next day where they planned to meet up with his publicist, she said.

In an interview with People on Thursday, Scourby told how once in his hotel room, Piven, now 52, forced himself on her then exposed his genitals and began rubbing himself on her body.

'He jumped on top of me. I tried to push him off and he forced me to the ground,' she said.

For 15 minutes, Piven rubbed his bare genitals on her fully clothed body then 'ejaculated' on to her white turtleneck, she claimed.

Advertising executive Tiffany Bacon Scourby (left) says Piven attacked her in 2003 in his hotel room. Porn star Isis Taylor (right) says he exposed himself to her at a party in 2011

Piven (pictured in September) has so far denied some of the accusations against him but has not addressed them all. Four separate women now say he sexually harassed or assaulted them

Scourby, now a married mother-of-two, claims she then fled the hotel room and went back to Washington DC.

Piven categorically denied Bacon-Scourby's accusations in a strongly worded statement.

'Let me be absolutely clear, this simply did not happen. I would never force myself on a woman, ever. I cannot speak as to why a person would create a story like this,' he said.

One of his representatives added that he was willing to take a polygraph test to 'prove' her claims were lies and that he was also considering legal options.

His representatives did not comment on Taylor's claims when contacted by DailyMail.com.

Bacon-Scourby says that after his attack on her, she got the train back to Washington DC from New York and 'cried the whole way'

In her description of their meeting, Bacon Scourby said she met Piven the night before the attack at a nightclub.

'He was very nice to me. He mentioned he was going to [tape an appearance on] the next day and gave me his number and asked me to go with him as his guest.'

The following day, she says she met him at his hotel and they were in his room, waiting for his publicist, when he allegedly threw himself on her.

'I remember I was wearing this white ribbed turtle neck and brown slacks — business attire — and I was sitting right next to him on the couch.

'We were talking for about five minutes and he said he was waiting for his [publicist] to come with us.'

After the 15-minute alleged attack, she said she ran out of the room.

'I pushed him off of me and ran down the short hallway to get to the door. I rubbed my chest against the wall to get his [semen] off of my sweater. I ran outside and hailed a cab and I just burst into tears. I cried the entire way back to my hotel,' she said.

She then got a train back to DC and cried during that journey too, she said.

In a 2013 interview (above) porn star Isis Taylor told how Piven harassed her two years earlie

Taylor (pictured recently) said she never saw the actor again after their alleged meeting

In a newly surfaced 2013 interview, Taylor claimed the pair met at an after-party for the 2011 NBA All Star game. She says he approached her and asked: 'Do you know who I am?'

At the time, Piven had been one of the standout stars of Entourage for four years and was well known in Hollywood.

When she said she did not know his name but recognized his face, he replied: 'I'm Jeremy Piven, have you been living under a rock?'

The pair then went outside to smoke, she said, and Piven, with a cigar in one hand, exposed his bare penis to her.

'All of a sudden [Piven] is like "Look all this can be yours," as he points to his d**k. I look down, and his d**k is full blown out.'

She said Piven urged her: 'Just touch it, just touch it,' but she refused.

'I'm like, "alright, well this has been real. I'm going to go back inside." I walked back inside and that was the last time I saw Jeremy Piven.'

He has already denied the accusations of two other women who allege he assaulted or harassed them.

On October 30, Playboy model Ariane Bellamar says he 'cornered' her in his trailer on the set of the HBO hit Entourage.

Bellamar was guest appearing in an episode of the show when she says she found herself alone with Piven who is beloved for his portrayal of the hot-headed talent agent Ari Gold. On Twitter, Bellamar fired off a string of claims about their alleged encounter.

Playboy model Ariane Bellamar (above in 2013) made the first claims against Piven. She says he groped her without her permission on two occasions

Playboy model Ariane Bellamar made the first accusations against Piven on October 30 (above)

Bellamar claimed she Piven attacked her in his trailer on the set of Entourage. He is pictured (far right) in a 2007 promotional shot for the HBO series in which he played Ari Gold

'Member when you cornered me in your trailer on the Entourage set? 'Member grabbing my boobies on the couch without asking? 'Member when I tried to leave; you grabbed me by the a**, looked at yourself in the mirror and said what a "beautiful couple" we made?

'Don't try to deny it, sir. HBO has us on film together and I'm sure sprint has electronic back-ups of your abusive, explicit texts,' she said.

Bellamar,who was also featured on Beverly Hills Nannies, also claimed that he cornered her a second time at the Playboy Mansion.

Longmire actress Cassidy Freeman, 35, accused Piven of misconduct on Instagram last week

Bellamar was the first to speak out against Piven but when he publicly denied her claims, Longmire actress Cassidy Freeman shared her own accusations.

On November 1, writing on Instagram alongside a screenshot of a news article reporting Piven's denial of Bellamar's claims, Freeman said: 'You will deny this because, sadly, she's deniable.

The backlash this woman has received is horrendous. Whether or not her accusations are true, I know what you did and attempted to do to me when I was far too young. THAT I know. And you know it too.’

Piven had responded to Bellamar's claims with this statement: 'I unequivocally deny the appalling allegations being peddled about me.

'It did not happen. It takes a great deal of courage for victims to come forward with their histories, and my hope is that the allegations about me that didn’t happen, do not detract from stories that should be heard.'

After Freeman's claims emerged on November 1, a segment he had taped for Stephen Colbert's Late Show was scrapped and replaced.

Freeman shared this post which included his denial of another woman's accusations and spoke vaguely about what he did to her when she was 'far too young'

It should have been aired on Friday November 3. Instead, the show had journalist Ronan Farrow on to talk about his New Yorker expose which contributed to the downfall of disgraced movie mogul Harvey Weinstein.

It was a poignant choice for the CBS producers and Colbert who gave Farrow ample time to discuss how he was threatened and intimidated by Hollywood lawyers and publicists while working on his 10-month investigation into Weinstein.

Piven among a growing number of celebrities whose alleged sexual misconduct has been discussed publicly since the Weinstein allegations emerged.

Piven has found an ally in model Joanna Krupa who last week said his accusers were merely trying to get famous.

'I love Jeremy Piven, like I’ve known Jeremy Piven for a very long time. He’s like the nicest f***ing guy I’ve ever met.

'Jeremy never did anything wrong to me. He’s always been an amazing friend to me, so I support him.

'I think people are taking advantage of the whole situation with Weinstein, and they’re trying to make a living or they’re trying to get famous,' she told The Blast.