'Real Housewives' star Luann de Lesseps reveals the 'final straw' in her marriage to Tom D'Agostino

The Countess is getting candid.

Luann de Lesseps sits down with Andy Cohen for her first on-camera interview since splitting from her husband of seven months, Tom D'Agostino, a few weeks back. It's all for a special episode of Watch What Happens Live With Andy Cohen filmed at Luann's Hamptons home.

"Was there any one event that led to the filing?" Andy asks the Real Housewives of New York City star.

"It was, like, the weekend before the reunion, basically," Luann reveals. RHONY's season nine reunion taped just three weeks before she announced her divorce. At the time, she was still defending her marriage and seemingly trying to make it work with Tom.

"Tom went out and he called up an old girlfriend, and they went out with a group of people and I didn't know about it," she shares. "I found out about it the next day in the press. So for me, that was, like, the final straw. I can't do this anymore."

After that confession, Andy asks Luann about the report she was seen slapping Tom in a restaurant, which she previously denied. The timing of the alleged slap would line up with the timing of Luann's "final straw."

See photos of the former couple together:

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LuAnn de Lesseps and boyfriend, Tom
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LuAnn de Lesseps and boyfriend, Tom
***USA OUT***CANADA OK*** NEW YORK - SEPTEMBER 21: Luann de Lesseps & Tom D'Agostino at National Geographic Channel 'Years Of Living Dangerously' Season 2 World Premiere held at American Museum of Natural History, on September 21, 2016 in New York City. PHOTOGRAPH BY PhotoImagePress / Barcroft Images London-T:+44 207 033 1031 E:hello@barcroftmedia.com - New York-T:+1 212 796 2458 E:hello@barcroftusa.com - New Delhi-T:+91 11 4053 2429 E:hello@barcroftindia.com www.barcroftimages.com Keywords: (Photo credit should read PhotoImagePress/Barcroft Images / Barcroft Media via Getty Images)
WATER MILL, NY - AUGUST 5: Countess Luann de Lesseps and Thomas D'Agostino attend Tom & Diane Tuft and Christina Cuomo Celebrate the Launch of Jay McInerney's New Novel 'Bright, Precious Days' at Private Residence on August 5, 2016 in Water Mill, NY. (Photo by Patrick McMullan/Patrick McMullan via Getty Images)
WATER MILL, NY - JULY 30: Luann de Lesseps and Tom D'Agostino Jr. attend the 23rd Annual Watermill Summer Benefit at The Watermill Center on July 30, 2016 in Water Mill, New York. (Photo by Steve Mack/FilmMagic)
WATER MILL, NY - JULY 30: Luann de Lesseps and Tom D'Agostino Jr. attend the 23rd Annual Watermill Summer Benefit at The Watermill Center on July 30, 2016 in Water Mill, New York. (Photo by Steve Mack/FilmMagic)
NEW YORK, NY - JULY 11: Luann De Lesseps and Tom D' Agostino attends the Hulu Original 'Difficult People' premiere at The Metrograph on July 11, 2016 in New York City. (Photo by Jimi Celeste/Patrick McMullan via Getty Images)
WATER MILL, NY - JULY 30: Campion Platt, Luann de Lesseps, Tom D'Agostino Jr. and Tatiana Platt attend the 23rd Annual Watermill Summer Benefit at The Watermill Center on July 30, 2016 in Water Mill, New York. (Photo by Steve Mack/FilmMagic)
Countess LuAnn de Lesseps, Jacques Azoulay, John Leguizamo and Tom Murro attend the 6th annual Made In NY awards at Gracie Mansion on June 6, 2011 in New York City. (Photo by Steve Mack/FilmMagic)
NEW YORK, NY - FEBRUARY 13: Alex McCord (L), Ramona Singer (2nd L), Tom Murro (C) and LuAnn De Lesseps (R) attend the Zang Toi Fall 2013 fashion show during Mercedes-Benz Fashion Week at The Stage at Lincoln Center on February 13, 2013 in New York City. (Photo by Astrid Stawiarz/Getty Images for Mercedes-Benz Fashion Week)
NEW YORK, NY - SEPTEMBER 10: (L-R) Miss USA 2013 Erin Brady, Miss Teen USA 2013 Cassidy Wolf, LuAnn de Lesseps, Ramona Singer, Sonja Morgan and Tom Murro attend the Zang Toi show during Spring 2014 Mercedes-Benz Fashion Week at The Stage at Lincoln Center on September 10, 2013 in New York City. (Photo by Kyle Blair/WireImage)
NEW YORK, NY - JULY 11: Luann De Lesseps and Tom D' Agostino attends the Hulu Original 'Difficult People' premiere at The Metrograph on July 11, 2016 in New York City. (Photo by Jimi Celeste/Patrick McMullan via Getty Images)
SOUTHAMPTON, NY - JULY 23: Tom D�gostino Jr. and Luann D'Agostino attend Janna Bullock Celebrates an Endless Summer at Private Residence on July 23, 2017 in Southampton, New York. (Photo by Patrick McMullan/Patrick McMullan via Getty Images)
NEW YORK, NY - JULY 18: Tom D'Agostino Jr and LuAnn de Lesseps are seen in Soho on July 18, 2017 in New York City. (Photo by Raymond Hall/GC Images)
NEW YORK, NY - JULY 18: Tom D'Agostino Jr and LuAnn de Lesseps are seen kissing in Soho on July 18, 2017 in New York City. (Photo by Raymond Hall/GC Images)
NEW YORK, NY - APRIL 05: Tom DAgostino Jr. (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 05: Tom D'Agostino and Luann D'Agostino 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 Robin Marchant/Getty Images)
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"I didn't slap him," she reiterates. "What I did was grab his face, and it was in the heat of the moment and I was hurt in the moment. I wanted his attention, so I grabbed his face. It wasn't really a slap."

Watch What Happens Live One-on-One With Luann de Lesseps is set to air on Wednesday, Sept 6, at 11 p.m. ET. Part three of the season nine reunion airs this Wednesday, Aug. 30, at 8 p.m. ET on Bravo.


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