President-elect Donald Trump said outgoing first lady Jill Biden “couldn’t have been nicer,” after the pair were spotted having a very friendly encounter during the reopening of the Notre Dame Cathedral in Paris.

Despite their major political differences during the past three election cycles, Trump told The Post in a wide-ranging phone interview Sunday that he had a positive interaction with President Biden’s wife.

“Very nice. She couldn’t have been nicer,” Trump said of their exchange.

“It’s politics. You have to get used to it,” he added about their past political spats.

“She was very nice and we had a very nice conversation.”

It comes after the pair were pictured engaging in some rare cross-party camaraderie while seated alongside dignitaries inside the iconic church earlier on Sunday.

Trump and the First Lady shared the moment while waiting for French First Lady Brigitte Macron to take the seat that separated them during the reopening ceremony.

Their caught-on-camera side-chat inside the cathedral quickly delighted the MAGA world and sparked a frenzy of speculation online about what their conversation entailed.

Some speculated that the first lady actually supported Trump during the 2024 election — despite her history of harsh words for him and the President-elect’s past history of attacking her husband.

“I just want to find someone that looks at me the way Jill Biden looks at Trump,” one user posted on X.

“Jill Biden looks like she’s in love with the BOSS Trump. 100% confirmed she voted for Trump!” another wrote.

“She voted for him. It’s settled science,” one user chimed in.