Top Trump adviser Kellyanne Conway got into a fight — and allegedly punched a guy — at the exclusive inaugural Liberty Ball just hours after the new president was sworn in.

Witnesses said Conway intervened when two men, who appeared to be in her entourage, got into a fistfight at the starry invite-only bash at the Washington Convention Center on Friday.

Conway — currently under fire for her “alternative facts” comment — was seen pushing the two bigger guys apart, then appeared to throw some “mean punches” at one of the brawlers.

Fox Business star Charlie Gasparino, who witnessed the incident, wrote on his Facebook page: “Inside the ball we see a fight between two guys in tuxes and then suddenly out of nowhere came Trump adviser Kellyanne Conway who began throwing some mean punches at one of the guys. Whole thing lasted a few mins no one was hurt except maybe the dude she smacked. Now I know why Trump hired her.”

The fracas allegedly kicked off near a VIP area at the ball shortly after Trump and first lady Melania Trump completed their first dance and left, and it looked like it involved friends or family of Conway. Other guests at the glittering ball included Floyd Mayweather Jr., Caitlyn Jenner, beauty queen Carrie Prejean, Duane “Dog” Chapman, Rex Ryan and Mark Sanchez.

On Facebook, Gasparino called the alleged Conway incident “even more insane” than another he claims he witnessed. He writes that when he met his pal Scott Baio outside the Victory Ball, “a bunch of anarchist thugs” began “screaming, ‘Hey Chachi are u fascist?’ ” at the former “Happy Days” star. Gasparino further alleges that “one made an aggressive move toward us . . . I shoved him away and he said, ‘touch me again u little p - - ck and I’ll smack u’ . . . My response: ‘GFY a - - hole’ . . . that’s when my producer Brian Schwartz intervened and crisis was averted.” (We’ll let you figure out what “GFY” stands for.)

Gasparino did not comment on the Facebook post in which he also wrote, “Btw I exaggerate none of this.” Conway did not get back to us.

Video: Everything you didn’t know about Kellyanne Conway