Jamie Dimon, the CEO of JPMorgan Chase, threw a lavish celebration in honor of King Charles’ 77th birthday on Thursday. The event took place in the bank’s newly built skyscraper in Manhattan.

The party was a grand affair—what the British might describe as a “knees-up”—highlighted by a massive projection of the Union Jack on JPMorgan’s brand-new $3 billion headquarters.

Although King Charles did not attend, the gathering was graced by members of the British Consulate, alongside celebrities like actor Brian Cox and former Prime Minister Tony Blair. Guests reportedly toasted to “Long live the king” after first raising a cheer for President Trump, as reported by The Wall Street Journal.

King Charles marked his birthday on November 14, following a series of health challenges, including a cancer diagnosis. The specific type of cancer has not been disclosed by the palace.

Held in the newly designed building by architect Lord Norman Foster, the event featured quintessential British fare such as Yorkshire pudding and beef pie with Stilton cheese. The room was adorned with photographs of the royal family and former Presidents Reagan and Trump, according to The Journal.

There were also tables with sushi and nigiri sushi for those adverse to British pub grub.

Members of Parliament and British nobles wearing kilts chatted with reality TV stars like Ubah Hassan from “The Real Housewives of New York City” and Mary Holland Nader from “Love Thy Nader,” The Journal reported.

The belated birthday party might have seemed unusual for a number of reasons – not only was Charles thousands of miles away; the festivities took place in a country readying to celebrate 250 years of independence from the Brits. 

But it wasn’t such an unexpected move for Dimon, who has been growing closer with British Prime Minister Keir Starmer’s government and is friendly with French President Emmanuel Macron. He met the king during a global investment summit in the UK in 2023.

Dimon used the event to spread his goal of bringing the US and Europe closer together, warning of the dangers of a weakened trans-Atlantic alliance as he thanked the British for their help in countering Nazism. 

“There’s a whiskey bar back there,” he said on a less serious note to roughly 400 guests as he took to the stage. “Thank God, mostly Scottish whiskey.”

Varun Chandra, Starmer’s special adviser on business and investment, made a speech that flopped with a string of “very cringeworthy and overused Dad jokes” about the differences between Britain and the US, an attendee said.

Guests told The Post that Chandra’s speech made passing references to how Britons pronounce “z” as “zed” and how Americans don’t really understand “football” — what is known as soccer on this side of the Atlantic.

“Nobody laughed. Everyone was just waiting for him to finish,” said an insider who was among the 400 or so onlookers. 

Dimon was surrounded all night by people angling to take photographs with the exec – staying behind with a drink in hand for more than two hours after many JPMorgan execs had already left, according to The Journal.

A major history buff, Dimon nodded to JPMorgan’s British ties during his speech. 

Founder J. Pierpont Morgan came from a family of English merchants, and his son, Jack Morgan, was good friends with King George VI – Charles’ grandfather. 

But representatives of the British Consulate didn’t skim over the event’s blatant irony.

“We’re just about to begin the celebrations for 250 years of American independence from the British monarch, and here we stand in this temple of American freedom and prosperity to celebrate the birthday of the British monarch,” Chandra said during his speech.

Back in the 1600s, King Charles II ousted the Dutch from New Amsterdam and gave the territory to his brother, the Duke of York – renaming it New York in his honor.

JPMorgan did not immediately respond to The Post’s request for comment.