President-elect Donald Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE arrived for an upscale costume party Saturday night on Long Island, according to pool reports.

Trump adviser Kellyanne Conway shared a photo of herself alongside Trump while wearing a Superwoman costume for the "Heroes and Villains" themed party, tweeting, "Honoring the ultimate hero."

Honoring the ultimate hero at the Mercer "Heroes and Villians" party on Long Island. Crowd thrilled w/ surprise! pic.twitter.com/VQAyaKvs6i — Kellyanne Conway (@KellyannePolls) December 4, 2016

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.

Trump arrived at the party wearing a dark suit, overcoat and tie, according to pool reports. When asked who he was dressed as, Trump pointed to himself and mouthed, "me."

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Politico first reported Trump's plan to attend the party, which was being thrown by hedge fund magnate Robert Mercer and his daughter Rebekah Mercer, both influential supporters of the president-elect.

Spokespeople for Trump and the Mercers declined to comment on the Politico report.

Invitations reportedly featured “a sword-wielding centurion crouching in an ancient ruin, facing down a serpent-haired Medusa.”

– Paulina Firozi contributed

Updated: 9:20 p.m.