Aubrey O'Day kicked out of party mocking alleged ex Donald Trump Jr.

Aubrey O'Day had an eventful New Year's Eve, to say the least.

The Danity Kane singer performed a three-song set at a faux birthday party for her alleged former boyfriend Donald Trump Jr. at Hustler Club in Las Vegas on Monday night, before being kicked out of the club for throwing a fit.

TMZ reports that O'Day wasn't too happy when a birthday cake for Trump Jr. was wheeled out after her performance. Adding insult to injury, organizers asked her to sing "Happy Birthday" to the first son, which was not part of her agreement to perform at the New Year's Eve celebration.

SEE ALSO: Omarosa claims that Aubrey O'Day showed her 'dirty texts' from Donald Trump Jr.

The outlet posted a video of a club manager escorting O'Day and her entourage out of the nightclub after one of her assistants got physical with an employee.

Trump Jr. reportedly had an affair with O'Day for several months starting on the set of "Celebrity Apprentice" at the end of 2011 until March of the following year. Things got so serious between the pair that Trump Jr. was allegedly preparing to leave his then-wife, Vanessa Trump, with the intention of starting a family with the pop star.

"When it started, he and Aubrey were very serious all of a sudden," an Us Weekly source said earlier this year. "He told her it was over with his wife, that they were separated and he didn’t love her -- all of that stuff. [...] Aubrey fell for him hard. She thought they were going to be together for real."

"Don told Aubrey he wanted to have a baby with her," an insider told Us Weekly. "They were trying for one."

The affair ended when Vanessa uncovered emails and text messages between her husband and O'Day. She reportedly called the singer and "went gangster" on her.

SEE ALSO: Aubrey O'Day references alleged Donald Trump Jr. affair in new pic

"Vanessa said some extremely unladylike things to her," a source told Page Six of the call, adding that "the call involved the usually demure Vanessa comparing her and childless O'Day's bodies and sexual capabilities in violently graphic terms. Apparently, this is a side of the glossy blonde she occasionally unleashes at extreme moments."

Neither Donald Trump Jr. nor Aubrey O'Day have confirmed their romance, but O'Day has alluded to the tryst several times in the past.