Heather Thomson has leveled a serious charge against Sonja Morgan.

The “Real Housewives of New York City” star alleges that Morgan, 57, let men to “put lit cigarettes in her vagina” in Dave Quinn’s bombshell new tell-all book, “Not All Diamonds and Rosé: The Inside Story of the Real Housewives from the People Who Lived It.”

The 51-year-old made the outrageous accusation in the wake of reports that Sonja was “fired” from the show.

Thomson, 51, detailed the alleged event in a chapter on the “RHONY” Season 7 cast’s trip to Atlantic City in the book.

Morgan allegedly had Thomson and another co-star Kristen Taekman wait in the foyer of her fancy home while She was getting ready for the trip, according to Thomson.

Thomson claimed that despite the fact that it was “raining out,” Morgan refused to invite her and Taekman into the house.

“That’s when I turned on Sonja,” Thomson told Quinn, “because I had literally carried that woman home. I had scraped her off carpets. I had taken her out of a vestibule where she was letting guys put lit cigarettes in her vagina.”

“I had done so much for that woman,” she said. “And here we are, waiting to go to Atlantic City. We all arrived at her house, but the limo wasn’t there yet. And it was raining out. Well, she would not let us in.”

As Sonja never responded to Heather’s comments about the alleged event, she did explain why she never came down to see how her co-stars were doing while they waited for her at her house.

“I was upstairs, and my sister called me to tell me someone we knew had died,” she explained. “She was supposed to come take care of my daughter [Quincy], but because of this death, she couldn’t. I didn’t have a housekeeper, and I had my daughter there who doesn’t film…anything could go wrong.”

She went on to state that she was afraid to leave her daughter alone because she “could be kidnapped” before labeling Thomson a “fake” who was “was playing it up for the cameras.”

Heather, on the other hand, argued that her reaction was “as real as real can be.”

Thomson and Taekman finally broke into Morgan’s house against her will, which enraged the Bravolebrity.

“If the situation were reversed, I wouldn’t go running through Heather’s house,” she remarked. “Wait in the f—king car! Rudeness! And they spilled coffee on my gold-inlay family table.”

Heather’s charges regarding Sonja may be true, since the Bravo actress is notorious for her crazy antics and inebriated behavior.

After the 2015 season, both Thomson and Taekman left the show.