Buckle in for the Ramona coaster.

“Real Housewives of New York City” newbie Sai De Silva called out former cast member Ramona Singer for not welcoming her to the franchise with open arms.

“Ramona was a total bitch to me at Art Basel,” De Silva, 42, said on “Watch What Happens Live” Sunday, referring to the December 2022 festival in Miami.

Andy Cohen did not seem too shocked and asked his guest whether she “went up to” Singer.

“I introduced myself,” the content creator replied before the Bravo host, 55, cut her off and guessed, “Oh, boy, that didn’t go well.”

De Silva confirmed the conversation “didn’t go really well.”

“She treated me like a big — like, not a good fan,” she explained. “Then after that, I proceeded to say, ‘Oh, I just wanted to introduce myself. I’m on the reboot, the new era.'”

The fashion influencer claimed Singer, 66, responded, “‘Honey, good luck. You’re gonna need it.'”

Singer’s rep didn’t immediately respond to Page Six’s request for comment.

De Silva previously teased that she had met a fellow “Housewife” who was not very kind to her, but she kept her identity under wraps at the time.

“I met someone who wasn’t very nice, but I won’t say who,” she told Cosmopolitan in June.

De Silva’s co-star Erin Dana Lichy also insinuated she a bad experience with the unnamed woman, chiming in, “I think she was mean to a lot of people.”

Fellow “RHONY” newcomer Jenna Lyons, meanwhile, added that the mystery “Housewife” was “definitely salty.”

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However, Ubah Hassan told the magazine that she “love[s]” Singer and found her “funny.”

“We met at a lounge and she asks, ‘Are you married?’ and I said no, and she was like, ‘Forget it after this show,'” she recalled. “You might think it was mean, but it was hilarious.”

Singer met the rebooted “RHONY” cast — which also includes Brynn Whitfield and Jessel Taank — at NBCUniversal’s annual upfront presentation in May.

The new cast posed for a photo with several members of the “The Real Housewives Ultimate Girls Trip: RHONY Legacy” cast — starring Singer, Luann de Lesseps, Sonja Morgan, Kelly Bensimon, Kristen Taekman and Dorinda Medley.

“The Real Housewives of New York City” airs Sundays at 9 p.m. ET on Bravo.