"A waitress just hit me - punched me for no reason," LiLo tweeted on the night before her 24th birthday, which she celebrated at Voyeur nightclub.
"All I have to say is that disturbed little train wreck is delusional," Waltz said in a statement to Access Hollywood on Friday night.
"I didn't hit her," Watlz added. "But I'd like too."
As previously reported on AccessHollywood.com, early Friday morning – the start of Lohan's 24th birthday – around the time she left Voyeur, a nightclub in Los Angeles, the actress Tweeted, "A waitress just hit me."
Lohan did not Tweet the name of the waitress she claimed attacked her, but added that the woman, "Punched me for no reason."
Earlier in the day, however, sources inside the club told Access Hollywood a punch had occurred and it was over the waitress' ex, British Rugby star Danny Cipriani, who Lindsay has recently been seen with.
The sources went on to say that Voyeur is still deciding how to discipline the waitress – who has reportedly dated Ryan Seacrest, "Star Trek's" Chris Pine and singer Jesse McCartney – but that she will likely be fired.
The sources also noted that Lindsay arrived for her celebration with two friends and was seen table-hopping throughout the club.
A rep for Voyeur told Access, "We were happy to have Lindsay Lohan celebrating her birthday at Voyeur last night."
The alleged punch marks the start of Lohan's birthday and July 4th weekend – which, according to a TMZ source close to Lindsay, will not be filled with partying.
The source claimed Lindsay doesn't have any major celebrations planned for the weekend — or the funds to pay for it.
"I mean there's not much you can do with a monitoring bracelet and no money," the source reportedly said.
Lindsay is due in court on Tuesday, where she will face Judge Marsha Revel, who previously ordered the 24-year-old actress to wear her SCRAM alcohol-monitoring device.
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