When she won the crown, Conner criticized pop stars like Britney Spears as being too wild and racy.

"Tara was a party animal," said a source who knows Conner, 20, and Miss Teen USA Katie Blair, 18, from some of the city's top nightspots. "I've seen them kiss before. They always dance all sexy on the tables. ... They definitely get close."

Conner's troubles allegedly stem from inappropriate behavior at New York City nightclubs. The beauty queen turns 21 on Monday.

Sources told the New York Post that Conner's issues included substance abuse, failing to make Miss USA promotional appearances, chafing at other obligations and nonstop nightclubbing at Big Apple hot spots.

"She makes Paris Hilton look like a baby," a source, who confirmed Conner's conduct has been a concern since summer, told the Post.

The furor has led Conner to cancel plans to celebrate her upcoming 21st birthday with dual bashes at the Pure club in Las Vegas, and at Stereo in New York.

The beauty queen has been romantically linked to two of Stereo's owners and celebrities who cavort at the NYC hot spot, including MTV veejay Damien Fahey, according to the Post.

A source close to the New York nightclub Ultra told FOXNews.com that Conner had been there last Friday with several other beauty pageant title holders for a private party for a photographer, held in one of the club's VIP rooms.

He said Conner wasn't drinking, but she was dancing and having fun.

"We didn't witness her drinking any alcohol," said the source, who was at the club when Conner was. "She was a young girl having a good time — she was dancing, she was having a great time, but nothing that would be out of the ordinary for someone her age."

Pageant boss Donald Trump scheduled a Tuesday news conference to announce her fate.

"First and foremost he is concerned about Tara and wants to do what is best for her," Trump's office said. "Then he will think about what is best for the very successful Miss USA pageant."

One clubgoer described for the Daily News seeing Conner snort cocaine in one of the nightclubs where she drank regularly despite being underage, and The News learned she recently failed a drug test.

The Miss USA runner-up, Miss California USA Tamiko Nash, would inherit the crown if Conner can't finish her reign.

"She really is a small-town girl. She just went wild when she came to the city," one nightlife veteran said. "Tara just couldn't handle herself. They were sneaking those [nightclub] guys in and out of the apartment."