"He grabbed my a-- in an elevator, he was just a pig. I haven't told anybody about that before. I was grossed out. I was like 'How dare you.,'" she recalled to the Daily Beast.
"He invaded me, he took advantage of me, being who he is, thinking he is all 'it,' all everything," she continued. "He thought he could just do that. I looked at him and said, 'Don't ever do that again.'"
The incident reportedly happened "around three summers ago" at the Soho Beach House in Miami, de Lesseps, 52, said.
De Lesseps also said that Simmons, 60, did not apologize.
She also shared that she endured sexually inappropriate behavior by men throughout her life, including the Simmons incident.
Related: See the reality star out and about
Luann de Lesseps out and about
Luann de Lesseps out and about
PALM BEACH, FL - DECEMBER 24: (EDITOR'S NOTE: Best quality available) In this handout provided by the Palm Beach County Sheriff's Office, Reality TV Personality Luann de Lesseps poses for her booking photo after being charged with battery of an officer, public intoxication, resisting an officer and threatening a public servant on December 24, 2017 in Palm Beach, Florida. de Lesseps was released and is set to return to court on January 25, 2018. (Photo by Palm Beach County Sheriff's Office via Getty Images)
NEW YORK, NY - DECEMBER 14: Luann De Lesseps and Kim Heirston Evans attend A Christmas Cheer Holiday Party 2017 Hosted by George Farias, Anne and Jay McInerney at The Doubles Club on December 14, 2017 in New York City. (Photo by Patrick McMullan/Patrick McMullan via Getty Images)
NEW YORK, NY - DECEMBER 06: Luann De Lesseps attends DailyMail.com & DailyMailTV Holiday Party with Flo Rida on December 6, 2017 at The Magic Hour in New York City. (Photo by Slaven Vlasic/Getty Images for Daily Mail)
NEW YORK, NY - NOVEMBER 29: TV personality Luann de Lesseps attends the 'Meteor Shower' Broadway opening night at the Booth Theatre on November 29, 2017 in New York City. (Photo by Jim Spellman/WireImage)
CORAL GABLES, FL - OCTOBER 4: Luann de Lesseps at the American Red Cross South Florida Spectrum Awards kick off reception at Lilly Pulitzer Boutique at Merrick Park on October 4, 2017 in Coral Gables, Florida. (Photo by Manny Hernandez / Getty Images)
NEW YORK, NY - SEPTEMBER 07: Luann De Lesseps attends Fashion Does Drag Ball at The McKittrick Hotel on September 7, 2017 in New York City. (Photo by Michael Ostuni/Patrick McMullan via Getty Images)
BRIDGEHAMPTON, NY - SEPTEMBER 03: Luann de Lesseps attends the 2017 Hampton Classic Horse Show Grand Prix competition on September 3, 2017 in Bridgehampton, New York. (Photo by Sonia Moskowitz/Getty Images)
SOUTHAMPTON, NY - JULY 29: (L-R) LuAnn de Lesseps, Kelly Killoren Bensimon and Gizelle Bryant attend the Jill Zarin's 5th Annual Luxury Luncheon on July 29, 2017 in Southampton, New York. (Photo by Johnny Nunez/WireImage)
WATERMILL, NY - JULY 29: Luann DeLesseps D'Agostino attends the 20th Annual Super Saturday to benefit the Ovarian Cancer Research Fund Alliance at Nova's Ark Project on July 29, 2017 in Watermill, New Yor (Photo by Sonia Moskowitz/WireImage)
WATER MILL, NY - JULY 28: Tom D'Agostino Jr. and Luann de Lesseps attend Alzheimer's Association Hosts Rita Hayworth Gala Hamptons Kickoff Event at Private Residence on July 28, 2017 in Water Mill, New York. (Photo by Patrick McMullan/Patrick McMullan via Getty Images)
NEW YORK, NY - JULY 18: LuAnn de Lesseps are seen in Soho on July 18, 2017 in New York City. (Photo by Raymond Hall/GC Images)
NEW YORK, NY - APRIL 05: Jeff Lewis (L) and Luann de Lesseps attend 'The Real Housewives Of New York City' Season 9 Premiere Party at The Attic Rooftop Lounge on April 5, 2017 in New York City. (Photo by Johnny Nunez/WireImage)
NEW YORK, NY - APRIL 04: Candace Bushnell, Luann de Lesseps and Patricia Hearst Shaw attend Verdura Celebrates the Hearst Castle Preservation Foundation at Verdura Showroom on April 4, 2017 in New York City. (Photo by Patrick McMullan/Patrick McMullan via Getty Images)
NEW YORK, NY - APRIL 03: Luann de Lesseps and Tom Dï¿½Agostin attend the 2017 Tribeca Ball at the New York Academy of Art on April 3, 2017 in New York City. (Photo by Mike Coppola/Getty Images)
NEW YORK, NY - APRIL 03: LuAnn de Lesseps attends the New York Academy of Art Tribeca Ball Honoring Will Cotton at New York Academy of Art on April 3, 2017 in New York City. (Photo by Sean Zanni/Patrick McMullan via Getty Images)
NEW YORK, NY - MARCH 09: Tv Personality Luann de Lesseps and Nicole Nadeau attend the MTV RE:DEFINE 2017 - Parivate Preview And Auction Launch at Great Jones Studio on March 9, 2017 in New York City. (Photo by Nicholas Hunt/Getty Images)
NEW YORK, NY - FEBRUARY 10: Tom Dï¿½Agostino Jr. and Luann de Lesseps attend the Nicole Miller collection Front Row during, New York Fashion Week: The Shows at Gallery 2, Skylight Clarkson Sq on February 10, 2017 in New York City. (Photo by Astrid Stawiarz/Getty Images For New York Fashion Week: The Shows)
NEW YORK, NY - FEBRUARY 10: Luann de Lesseps attends the Nicole Miller Fall 2017 After Party on February 10, 2017 in New York City. (Photo by Patrick McMullan/Patrick McMullan via Getty Images)
NEW YORK, NY - FEBRUARY 09: Tom D'Agostino and wife Luann de Lesseps pose at the Opening Night of 'Sunset Boulevard'on Broadway at The Palace Theatre on February 9, 2017 in New York City. (Photo by Bruce Glikas/FilmMagic)
NEW YORK, NY - FEBRUARY 10: Luann de Lesseps attends the Nicole Miller collection Front Row during, New York Fashion Week: The Shows at Gallery 2, Skylight Clarkson Sq on February 10, 2017 in New York City. (Photo by Astrid Stawiarz/Getty Images For New York Fashion Week: The Shows)
NEW YORK, NY - OCTOBER 17: (EXCLUSIVE COVERAGE) TV personality Luann de Lesseps visits the SiriusXM Studios on October 17, 2016 in New York City. (Photo by Astrid Stawiarz/Getty Images)
NEW YORK, NY - OCTOBER 13: Reality star Luann De Lesseps attends Build Series to discuss 'Does This Make My Butt Look Big?' at AOL HQ on October 13, 2016 in New York City. (Photo by Steve Zak Photography/FilmMagic)
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As New Yorkers, de Lesseps and Simmons often crossed paths and were pictured together at a number of galas and charity events over the years both in New York City and the Hamptons.
Her claims come after the Queens hip hop mogul has been accused by at least a dozen women of sexual assault and has been accused of rape by six women.
On March 23, one of his accusers filed a $10 million lawsuit against Simmons alleging he sexually assaulted her.
The woman had previously filed three complaints against the star for forcible rape, intentional infliction of emotional distress and negligent infliction of emotional distress, according to documents obtained by Us Weekly.
De Lesseps recently admitted herself into rehab and is now sober after an arrest in Florida this December for resisting an officer with violence as well as misdemeanor charges of trespassing and disorderly intoxication. She rejected a plea deal in February related to the charges.
A rep for Simmons did not immediately respond to a Daily News request for comment.
Related: Famous faces accused of assault, misconduct
High-profile men accused of sexual harassment, assault and misconduct
High-profile men accused of sexual harassment, assault and misconduct
Movie producer Harvey Weinstein is accused of sexually assaulting or harassing dozens of women, including a number of well-known celebrities, over the past several decades.
Matt Lauer was fired from 'Today' after multiple women accused him of sexual misconduct that allegedly included giving a co-worker a sex toy and dropping his pants in front of a female employee in his office.
Actor Jeffrey Tambor has been accused of sexual assault by two women from the Amazon series, "Transparent."
Eleven women have come forward accusing President Donald Trump of unwanted touching or kissing. Trump has called the sexual harassment claims 'fake news.'
(Al Drago/Bloomberg via Getty Images)
CBS Corp CEO Leslie Moonves resigned from the company, the company said on Sunday, amid allegations of sexual assault and harassment.
(Dennis Van Tine/STAR MAX/IPx)
Sen. Al Franken is accused of kissing and groping a woman without her consent during a United Service Organizations (USO) tour in 2006.
(Photo By Tom Williams/CQ Roll Call)
Director Woody Allen has been accused of sexual assault by his daughter, Dylan Farrow. She says she experienced inappropriate behavior by her adoptive father on several occasions.
Hundreds of women accused longtime Hollywood writer and director James Toback of sexual harassment.
(TIZIANA FABI/AFP/Getty Images)
Comedian Louis C.K. has been accused of forcing women to watch him masturbate, according to the New York Times.
(Photo by Rich Fury/Getty Images)
Director Bret Ratner has been accused of sexual harassment by several women, including actresses Olivia Munn and Natasha Henstridge.
(Photo by Frazer Harrison/Getty Images)
Actor Anthony Rapp accused Kevin Spacey of making a sexual advance towards him when he was 14 years old.
Roger Ailes, the former president of Fox News Channel, was accused of sexually harassing former anchor Gretchen Carlson and several other women from the network.
(Photo by Stephen Lovekin/Getty Images)
Several women accused TV host Charlie Rose of sexual misconduct, including groping and lewd phone calls.
(Photo by Roy Rochlin/Getty Images)
Bill Cosby has faced sexual assault allegations from about 60 women, including several women who claim he drugged them.
(Photo by Gilbert Carrasquillo/Getty Images)
Four women, including several that were also fellow Scientologists, have accused actor Danny Masterson of sexual assault, according to HuffPost.
(Photo by Paul Archuleta/FilmMagic)
Mark Schwahn, the former "One Tree Hill" showrunner, was accused of sexual harassment by a large number of the show's cast and crew.
(Photo by JB Lacroix/WireImage)
Roy Moore faced multiple allegations of sexual misconduct with underaged girls.
Bill Clinton faced numerous allegations of sexual assault and misconduct while he was president of the United States, with accusers including Juanita Broaddrick, who accused him of rape, Kathleen Willey who said he groped her and Paula Jones who said he exposed himself to her without consent.
(Photo by Dirck Halstead/The LIFE Images Collection/Getty Images)
Actor Casey Affleck settled lawsuits out of court wth two women who accused him of sexual harassment.
(Photo by Alberto E. Rodriguez/Getty Images for Film Independent)
Bill O'Reilly has reportedly made numerous settlements with women who accused him of sexual harassment.
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Anthony Weiner, a former Democratic congressman was sentenced to 21 months in prison in September 2017 after pleading guilty to sexting a teenage girl.
(TIMOTHY A. CLARY/AFP/Getty Images)
Veteran journalist Mark Halperin has been accused of sexually harassing women while he worked at ABC News.
(Photo by Frederick M. Brown/Getty Images)
Singer R. Kelly is accused of holding women against their will in houses in Illinois and Georgia in a reported 'sex cult.'
(Photo by Noam Galai/Getty Images)
Former Fox Host Eric Bolling was accused of sending unsolicited lewd text messages to female colleagues.
(Photo by Roy Rochlin/Getty Images)
Director Roman Polanski fled the US after pleading guilty to unlawful sexual intercourse with a minor. Several other women have also come forward to accuse him of sexual assault.
Chef John Besh stepped down from the company he founded after female employees reported facing sexual harassment there.
(Photo by Mireya Acierto/Getty Images for NYCWFF)
Photographer Terry Richardson was labeled the 'Harvey Weinstein of Fashion' by the Sunday Times amid widespread accusations of sexual harassment by models.
(Photo by Eugene Gologursky/WireImage)
Singer Kesha accused Lukasz Gottwald aka Dr. Luke of drugging and sexually assaulting her on multiple occasions.
(Photo by Tommaso Boddi/WireImage)
Former champion boxer Mike Tyson was convicted of raping a Miss Black America contestant in 1992.
Former USA Gymnastics doctor Larry Nassar has been accused of sexual abuse by dozens of his former patients and athletes.
(JEFF KOWALSKY/AFP/Getty Images)
Music mogul L.A. Reid left his position as Epic Records CEO/Chairman in 2017 amid harassment claims by a female assistant.
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Amazon Studios chief Roy Price resigned following reports that he harassed a producer and ignored an actress' allegation of sexual assault by Harvey Weinstein.
(Photo by Paul Zimmerman/WireImage)
Several women have accused former President George H.W. Bush of groping them during photo ops.
Chris Savino (right), creator of 'The Loud House' was suspended by Nickelodeon after being accused of making unwanted advances toward multiple women.
(Photo by Vivien Killilea/Getty Images for SCAD)
Actor Steven Seagal was accused of sexual misconduct by Inside Edition's chief investigative correspondent Lisa Guerrero.
(Photo by Paul Archuleta/Getty Images,)
Michael Oreskes, senior vice president of news and editorial director of National Public Radio, was accused of inappropriate conduct with two women in 1990s.
Dustin Hoffman was accused of sexually harassing a production assistant when he was 48 and she was a high school senior.
Jeremy Piven was accused by actress Ariane Bellamar of groping her on two separate occasions. Piven 'unequivocally' denied the allegations.
Ben Affleck apologized for acting 'inappropriately' towards Hilarie Burton during an appearance on MTV's "Total Request Live" in 2003.
Aziz Ansari was accused of sexual misconduct by a woman he went on a date with.
Andy Dick was accused of sexual harassment and misconduct on set, including groping people’s genitals, unwanted kissing/licking and sexual propositions.
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Rep. Ruben Kihuen, (D) Nevada, was accused of making repeated, unwanted propositions for dates and sex to a woman that once worked on his campaign.
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Actor Ed Westwick was accused by actress Kristina Cohen of raping her in his home.
David Guillod, producer of 'Atomic Blonde,' is accused of drugging and sexually assaulting several woman.
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Andrew Kreisberg, the showrunner for "Supergirl," was suspended in November 2017 amid numerous sexual harassment allegations by members of his staff.
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Actor Tom Sizemore was reportedly told to leave a film set in 2003 after an 11-year-old actress told her mother that he had touched her genitals.
Steve Jurvetson left his own venture capital firm after allegations of sexual harassment
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A former model accused George Takei of sexually assaulting him 36 years ago.
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Olympic gold medalist Hope Solo accused former FIFA president Sepp Blatter of sexually assaulted her at an award ceremony in 2013.
A former writer for 'Mad Men' said the show's creator Matthew Weiner told her that she owed it to him to let him see her naked.
Ron Jeremy has been accused of sexually assaulting more than a dozen women and the allegations span more than 30 years.
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Multiple women accused producer Adam Fields of touching them inappropriately and sexually propositioning them.
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Rep. John Conyers (D-MI) has been accused of unwanted sexual advances by former staffers.
(Jonathan Ernst / Reuters)
John Lasseter, the head of Pixar and Walt Disney Animation Studios, was accused of crossing the line with employees, including unwanted hugs.
(Photo by Gregg DeGuire/WireImage)
Singer Nick Carter was accused of rape by a former member of the all-girl teen band Dream, Melissa Schuman.
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A singer accused billionaire Richard Branson of sexual assault during an event as his Necker Island in the Caribbean. Branson says he has no recollection of the matter.
Talent agent Adam Venit is accused of grabbing actor Terry Crews' genitals.
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Jeordie White (aka Twiggy Ramirez), Marilyn Manson former longtime bassist, was accused of rape by singer Jessicka Addams.
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Lockhart Steele, Vox Media's editorial director was fired after a former employee accused him of sexual harassment.
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Producer Bob Weinstein, Harvey Weinstein's brother, has also been accused of sexual harassment.
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Jesse Lacey of the band, Brand New, was accused of sexual misconduct, including soliciting nude photos from a teen girl in the past.
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Senior Correspondent for E! News Ken Baker California was accused of sexual harassment by two women.
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American film director Oliver Stone was accused of groping model and actress Carrie Stevens in the 1990s.
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Reporter Glenn Thrush was suspended by the New York Times after several women accused him of acting inappropriately when they were young journalists.
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Veteran radio host Garrison Keillor was fired by Minnesota Public Radio following claim of improper behavior.
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CNN producer Teddy Davis was fired after multiple accusations of harassment.
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Producer Russell Simmons stepped down from his companies following sexual assault and harassment accusations from two women.
Longtime conductor James Levine was suspended by New York's Metropolitan Opera after sexual abuse claims.
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Dylan Howard, editor in chief of the National Enquirer, was accused of sexual misconduct by several former employees, including forcing them to watch porn and openly discussing his sexual partners.
"X-Men" director Bryan Singer was accused of raping a 17-year-old boy on a yacht in a lawsuit filed in December.
Harold Ford, Jr.
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Chef Mario Batali has been accused by multiple women of "inappropriate touching in a pattern of behavior that spans at least two decades."
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PBS talk show host Tavis Smiley's show was suspended amid misconduct allegations made against him.
Former NFL quarterback Donovan McNabb was fired from his job as an ESPN contributor amid accusations of sexual harassment by a wardrobe stylist at the network.
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Sen. Jeff Klein (D-New York), was accused of forcibly kissing a former female staffer back in 2015.
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Ross Levinsohn, Los Angeles Times CEO and publisher, has reportedly been a defendant in two sexual harassment lawsuits and would rate the "hotness" of his female colleagues, according to a report by NPR.
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A woman accused magician David Copperfield of drugging, sexually assaulting her when she was teen model in the 80s, according to The Wrap.
James Franco was accused by several women of sexually inappropriate behavior. He was also criticized for wearing a "Time's Up" pin to the Golden Globes hours before the accusations against him surfaced.
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Barry Lubin, also known as Grandma the clown, resigned from Big Apple Circus after admitting to pressuring a 16-year-old girl into posing for pornographic photos in 2004.
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Arizona Wildcats head football coach Rich Rodriguez was fired amid troubling off-field allegations. His former administrative assistant says Rodriguez inappropriately grabbed and touched her.
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President Trump's former campaign manager Corey Lewandowski was accused of sexual assault by pro-Trump singer Joy Villa. She claims he hit her on the buttocks during an event at Trump International Hotel in Washington, D.C.
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Steve Wynn, Chairman and CEO of Wynn Resorts, has been accused of sexual misconduct by dozens of peple. The Wall Street Journal the casino mogul regularly pressured employees to perform sex acts.
Music exec and 'The Four' judge Charlie Walk was accused of sexual harassment by a former employee. Life Lab founder Tristan Coopersmith penned an open letter about Walk in January claiming he sent her lewd comment and cornered her in the bedroom he shared with his wife.
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Several women filed sexual harassment complaints against Humane Society CEO Wayne Pacelle, according to the Washington Post.
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Actor Scott Baio, was accused of molesting is former 'Charles in Charge' co-star Nicole Eggert when she was a minor.
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