Ramona Singer just can't stay at a party!
After the Singer Stinger was kicked out of a party a few months ago, RadarOnline has exclusively learned the Real Housewives of New York star was DISinvited from a co-star's birthday bash!
Luann de Lesseps' fiancé Tom D'Agostino threw her a surprise birthday party last night in his NYC penthouse apartment, but Singer was asked not to attend because the party guests complained about her!
"So many people threatened to not come if she was coming," the source said. "He didn't have much of a choice but to uninvite her."
Singer was invited to the super-exclusive soiree just this week, while other guests, including RHONY stars Dorinda Medley and Sonja Morgan, and past stars Jill Zarin and Kelly Bensimon, were invited a month in advance.
"Everybody hates her," the source said. "Everyone says she's constantly annoying and badmouthing people."
However, moments before the event, Singer was asked not to come personally by Luann's future husband, whom she once dated, and then tried to ruin the surprise!
"She was uninvited but she tweeted that before the party and she knew it was a surprise," the insider said. "That's why everybody hates her."
All dressed up and nowhere to go, Singer had her own Turtle Time on Snapchat where she ranted about her invitation being revoked.
"I cannot believe this crap. I'm ready to go out the door to Luann's surprise party. I'm invited by Tom and he just calls me and he disinvites me," she said. "I am fuming. I have Luann a gift and a refitted gift and now i get disinvited."
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Singer said the reason she was asked not to come was because "there's no room because there's rain coming" and she offered her apartment but was shot down.
Sources told RadarOnline.com that the main guest who did not want her there was John Mahdessian, Dorinda's boyfriend who kicked her out of a party he threw back in December.
"John called Tom to get Ramona uninvited," the source said. "It was a really nice party, good vibe, it was very fun—without Ramona."