Kellyanne Conway dressed up as Superwoman on Saturday night as she attended a Heroes and Villains themed costume party with Donald Trump and Steve Bannon.

But she lauded the president-elect for being the 'ultimate hero', and the two posed for a photograph at the palatial family estate of hosts Robert and Diana Mercer, in Long Island, New York.

Conway flourished her red cape next to Trump, who stuck with a suit, and tweeted: 'Honoring the ultimate hero at the Mercer "Heroes and Villians" party on Long Island. Crowd thrilled w/ surprise!'

Hedge fund manager Robert and his wife Diana Mercer donated $2million to the pro-Trump super PAC Make America Number 1, which was later headed by their daughter Rebekah Mercer.

Donald Trump was called the 'ultimate hero' by campaign manager Kellyanne Conway, who dressed as Superwoman at a lavish Heroes and Villains costume party (pictured)

Conway previously said she was planning to dress as Stephen Bannon, but opted for a more clear cut choice on Saturday, complete with a minidress and what appears to be a blonde wig

Conway is noted for being the first woman to run a successful presidential campaign

Trump, who stuck with a suit, took a break from mulling over Cabinet positions to attend the annual party, which has gained a reputation for being extravagant

Rebekah Mercer, daughter of hosts Robert and Diana Mercer, urged the Donald to bring both Conway and senior counselor Stephen Bannon (pictured) on board his campaign in August

Rebekah, who is on the transition team executive committee, urged the Donald to bring both Conway and senior counselor Stephen Bannon on board his campaign in August.

In total, the Mercer family has given more than $48million to campaigns, organizations or companies run by Trump's allies in recent years, according to Politico. The figures include a reported $10million investment in Breitbart News, where Bannon was a chairman.

Tickets to the annual event, hosted by the Mercers since 2009, are coveted in Republican circles, and this year's theme was not lost on Rebekah, who had previously dubbed the election between Trump and Hillary Clinton as an 'apocalyptic choice'.

While Trump and Bannon opted out not to wear costumes, staff and security were dressed as Hell's Angels and retro Salvation Army members.

The annual event is known for being a lavish affair, and the Mercer estate was guarded by a tank for last year's World War II-themed party.

Guests played blackjack and poker in previous years, with a free supply of chips that could be redeemed for gold Rolexes, Politico reported.

Conway told Bloomberg ahead of this year's party: 'I predict there will be an abundance of Hillary and Trump finery. We can’t get enough of this victory.'

The party was hosted at the Mercer's palatial Long Island estate (pictured, Trump's motorcade en route to the party)

Conway previously said she was planning to dress as Stephen Bannon, but opted for a more clear cut choice on Saturday, complete with a minidress, knee-high boots, and what appeared to be a blonde wig.

Bannon, who was the chairman at Breitbart, was described by Conway as a villain to the press, but a hero to many others. He was also in attendance sporting his usual look.

Trump ventured out of his Manhattan skyscraper the first time on Saturday to attend the party, and he is expected to lay low for the remainder of the weekend.

Transition meetings will resume in New York on Monday before he hits the next stop of his 'thank you' tour in North Carolina on Tuesday.

Robert (center) and Diana Mercer (right) donated $2million to the pro-Trump super PAC Make America Number 1, which was later headed by their daughter Rebekah Mercer (left)

Trump is also still mulling his choice to lead the State Department, one of the most powerful and prominent Cabinet positions.

According to two people close to the transition, Trump is moving away from both Rudy Giuliani and Mitt Romney, two of the front-runners for the job.

Trump is said to have been rankled by the former New York Mayor's international business ties and public campaigning for the job.

And while Trump has met twice with Romney, he's said to be aware of the risks of angering his supporters by tapping a Republican who was among his fiercest critics.

Former CIA director David Petraeus is still in the mix, though both people close to the transition said Trump's prolonged decision-making process has left the door open to other options.

One of the sources said Trump was open to expanding his short list of secretary of State prospects. Jon Huntsman, a former Republican Utah governor who also served as the ambassador to China and speaks Mandarin, may be a possibility.

The people close to the transition insisted on anonymity because they were not authorized to discuss the private process publicly.

Transition talks will resume Monday. According to two people close to the transition, Trump is moving away from both Rudy Giuliani and Mitt Romney, front-runners for Secretary of State

Trump also made no mention Saturday of his decision to speak on the phone with Taiwan's leader, a breach of long-standing tradition that risks enmity from China.

Trump's conversation with Taiwanese President Tsai Ing-wen drew an irritated, although understated, response from China, as Foreign Minister Wang Yi said the contact was 'just a small trick by Taiwan' that he believed would not change U.S. policy toward China, according to Hong Kong's Phoenix TV.

Chinese officials said they lodged a complaint with the U.S. and reiterated a commitment to seeking 'reunification' with the island, which they consider a renegade province.