Donald Trump attends lavish 'Heroes and Villains' costume ball -- dressed as himself

On Saturday night, President-elect Donald Trump attended "Heroes and Villains" -- a lavish costume ball on Long Island -- dressed as himself.

TheHill.com reported that Trump surprised party-goers when he arrived Saturday evening.

Trump 2016 campaign manager Kellyanne Conway shared a photo of herself dressed as Supergirl alongside the former reality TV star on Twitter, writing, "Honoring the ultimate hero at the Mercer "Heroes and Villians" party on Long Island. Crowd thrilled w/ surprise!"

"Conway had told Bloomberg she would be dressing as controversial Trump adviser and incoming White House chief strategist Steve Bannon, who she said she believes is a hero to everybody except the media," wrote The Hill's Harper Neidig.

The costume bacchanalia was thrown by Republican mega-donor and hedge fund billionaire Robert Mercer and his daughter Rebecca Mercer, both of whom were instrumental in having Conway and Bannon added to Trump's team in late summer when the campaign was sagging in the polls.