'RHONY' Preview: Dorinda Medley, Heather Thomson Fight — Watch 100th Episode Clip

What would a housewives celebration be without a big brawl? The gals of The Real Housewives of New York City are about to celebrate a huge milestone tonight as they are gearing up to air their 100th episode, however, it doesn't look like it is all cake and champagne, as the girls' Turks and Caicos trip is about to turn into a cat fight. Season seven has definitely not been without some blowups, and tonight is no different. Tension might have erupted between Sonja Morgan and Bethenny Frankel last episode, but Dorinda Medley and Heather Thomson are about to take their spots in the boxing ring tonight.

According to Us Weekly, the gals are not very happy with each other after Heather offended Dorinda with a comment while they were walking together on the beach. Apparently Dorinda told Heather to wait for her, which Medley didn't think that Thomson was too happy about doing.

"Quit yelling, when you said, 'Heather, will you wait for me?' I turned around and said, 'Sure,'" Thomson explained in the clip.

However, that isn't exactly what Dorinda heard. Instead she says that Thomson replied back, "What am I? One person?"

"You were very aggressive, I am never aggressive with you," Medley tells her co-star. "You should be nicer. You should say you're sorry because that was not nice the way that you just treated me."

When the fight seemed to go nowhere, Dorinda walked away saying, "Oh forget it! You're acting like a bitch."

Ramona Singer seemed to be the voice of reason in the Bravo TV clip, as she tells the ladies that they have to stop with the bickering, as it is making her physically sick.

"I have to say that you ladies just have to stop, all this arguing ... my stomach is like..." Ramona says while making a sickening face and rubbing her stomach.