EXCLUSIVE: 'The Real Housewives of New York' Tease 'Hiroshima'-Level Drama Bigger Than Bethenny Frankel and Lu

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Luann de Lesseps and Bethenny Frankel’s Berkshires blowout is just the tip of the drama iceberg this season, according to The Real Housewives of New York.

“There’s something else that transpires that you will not believe,” Ramona Singer teases ET. “You’re gonna have to watch the show, because it is beyond. It makes going up against Bethenny look like nothing. Like a piece of cake.”

WATCH: 7 Reasons Why This Is the Best Season of RHONY Yet!

That “something” also involves Luann. She wouldn’t say what it was, but did reveal she knew what Ramona was referencing.

"It’s quite a shocker to me,” Luann shares. “You have to wait and see it, but it’s a big deal … I’ve put it behind me already. So, you have to remember, we filmed a while ago, so this is something that happened… it was a complete surprise to me, so you’ll see that go down on the show.”

Luann went on to call the moment in question “Hiroshima,” referencing the World War II atomic bombing of the Japanese city.

“They literally play that song, ‘You Dropped a Bomb on Me,’ throughout our whole show,” Dorinda Medley jokes. “You see Luann -- boom!”

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“It won’t be easy [to watch],” Luann confesses. “But for me, right now, it’s in the past, and like I said, I move forward. I don’t dwell on the past, and so I’ve moved past it already.”

Sadly, it sounds like we might have to wait awhile to see the on-screen explosion.

“We really have a lot of fun this season, and you know, it ends with a bang,” Luann says. “Unfortunately, I’m like part of the bang, but you know, like Ramona said to me, ‘You’re always the star!’ … I was like, ‘This is not a happy moment for me,’ and that’s all she could say.”

Watch the drama go down every Wednesday night on Bravo, when The Real Housewives of New York airs at 9 p.m. ET. Get more scoop about the season in the video below.